A Guide to Choosing Your First Running Shoes for Beginner Runners

Without memorizing the 50 full sentences learned in the introductory course anew, you will expand your skills through training in speaking at length. Building on the ability to respond with a sentence reflexively, you will connect your thoughts for 30 seconds or more and ultimately develop the practical conversational ability to speak continuously about a single topic on your own for 3 minutes.

A reintroduction to high school mathematics that starts with nothing more than your memory of middle school math. The course is reorganized according to the causal relationships between concepts rather than the textbook order, so you first understand why each formula is needed. Designed to be completed in 24 weeks with 30 minutes a day, it helps working professionals and adult learners build a solid foundation in the mathematical concepts they encounter at work and in everyday life.

Learn practical techniques to start studying through structure rather than willpower. Master twelve execution design methods along with worksheets to lower the barrier to starting, recover broken focus, and prevent a single day's failure from turning into giving up.

An introductory course that makes the terminal less intimidating even for Linux beginners, teaching you how to view server logs, find files, and develop practical skills using just cd / ls / grep

This course is about redesigning the way you work—not just the tools you use. You’ll diagnose three sources of wasted time: delayed starts, rework, and overwork, then build a repeatable work system using templates, standards, and checklists. Through a principles-based approach applicable across roles, you’ll learn how to improve both the speed and quality of your work.

Learn step-by-step English expressions actually used in IT practice, from reading official documentation and writing tickets or emails to sharing incident reports and conducting technical interviews. Master practical English that you can apply immediately today with templates and examples extracted from over 20 years of infrastructure operations experience. Learn real-world business English for global collaboration, not just English for exams.

This is a hands-on course for systematically designing and building a multi-account environment based on AWS Organizations. It covers the entire landing zone implementation process, from designing the OU structure and Transit Gateway network architecture to the criteria for choosing between Control Tower and LZA, as well as strategies for incorporating existing accounts. Beyond simple console operations, you will develop the ability to make design decisions suited to your organization’s circumstances and establish an operational governance framework.

Connect the history from Gojoseon to the present day in a single thread through context rather than memorization. Learn how to read historical sources, understand the background of historical stories encountered in the news, dramas, and travel, and reinterpret history from the perspective of working people in this liberal arts course.

Clearly understand the four key differences between physical equipment–centric on-premises networks and AWS cloud networks, and first establish the overall coordinate system of AWS network architecture, from Region to AZ to VPC to Subnet. Although this lesson covers concepts only without hands-on practice, it also provides practical checklists and common mistakes to build a solid foundation for the rest of the 12-lesson course.

Analyze why your soccer skills have plateaued and learn how to overcome stagnation by understanding the principles of step-by-step growth. Through actionable routines—15-minute weekday training sessions, setting one goal per match, and writing a three-line post-match review—you can steadily improve your skills without additional time or expense.

Diagnose cost leakage in a Kubernetes cluster and learn the decision criteria and validation methods needed before introducing automation tools. Validate key cost-saving techniques such as Karpenter, Spot Instances, and Workload Optimization in read-only mode, then practice the entire process of safely applying them to production and rolling them back.

Identify the causes of weight-loss failure in environmental structures rather than willpower, and learn realistic weight-loss rates and goal-setting methods. Understand the mechanisms behind weight regain and learn a scientific approach to designing long-term success through sustainable environmental changes.

Beyond SEO, understand why GEO (Generative Engine Optimization) is necessary and how your content gets selected as AI generates answers. Start with the concepts and principles rather than tools or settings, then take your first step into GEO through hands-on practice checking whether your site is cited in AI answers.

Understand the five-stage structure of an automation pipeline and learn how to choose between building it yourself and using managed services in an AWS environment based on your organization’s needs. This covers the entire process required in practice—not only technical implementation, but also stakeholder alignment, project kickoff preparation, and operational process design.

Learn how to calculate the 20 minutes that disappear each week on an annual basis, and identify not only exact repetitions but also similar and hidden ones. Use the rule of three and cost-benefit analysis to decide when to improve, and adopt a practical approach that stops at the level you need among four stages, from documentation to automation.

This is a practical calculation process that establishes criteria based on the fundamental theorem of polynomials, reconstructs multiplication formulas using area diagrams, and streamlines division through synthetic division. The focus is on developing accurate organization habits and self-checking skills rather than calculation speed. It minimizes boredom and emphasizes connections to subsequent units to maintain learning motivation.

Learn the core principles of writing prompts to get the desired results from AI. Increase the accuracy of your requests through template-based structuring, and master a repeatable prompt design process through step-by-step verification and Git storage. Compare good and bad examples directly to develop request-writing skills that can be applied immediately in real-world work.

Understand the interpretation step that exists between events and emotions, and identify your own patterns of cognitive distortion. Through exercises in naming and rating the intensity of emotions, along with three-column recording, learn practical skills for handling emotions without being overwhelmed by them.

From determining whether a medical consultation is necessary to measuring your resting heart rate and calculating your target heart rate zones, you will learn systematically. You will gain practical knowledge on how to recognize signs to stop training and identify indications of injury, enabling you to continue running safely.

Develop practical interpretation skills by accurately understanding the yin-yang concept underlying Four Pillars of Destiny from a relativistic perspective, from distinguishing the yin and yang attributes of the heavenly stems and earthly branches to assessing the yin-yang balance within a saju chart. This training corrects the common misconception that yang is good and yin is bad, and provides perspective-adjustment exercises for interpreting yin-yang imbalances as strengths and weaknesses.

Leverage Python to create your own indicators and a convenient tool for securities analysis!

I want to create an algorithm trading bot that makes unlimited money and run it automatically. Where should I start?

The key to persuasion, visual data storytelling! Now, instead of lengthy explanations, you can package the core message you want to convey into a story and persuade your audience.

Basic knowledge to learn when starting Taekwondo

This course is for those who want to learn maker coding through entry block coding and learn the basics of coding. Even non-majors! Even students who are new to coding! You can learn the basic theories of coding and the basic usage of parts/sensors to engage in various maker activities.

Hula, the traditional Hawaiian dance that anyone of any age or gender can start right now! Let's share a time where your body and mind naturally unwind to the joyful music of Hawaii!

What if you could predict the future economy? Future Economic Prediction through Elliott Wave Theory!

Let's make your own self-driving car using block coding with Scratch and Entry!

Visual design techniques that go beyond data visualization to instantly persuade others From visual cognitive design to future scenario analysis and AI workflows, all at once

We explain 32 data visualization techniques very quickly and easily from a non-expert's perspective!

We will teach you equipment operation efficiency methods, including the main functions and implementation methods of equipment maintenance activities, and the establishment of your company's equipment efficiency management through step-by-step implementation examples of equipment management. By implementing failure-free equipment technology, we hope you will level up your daily maintenance activities and become an operator with strong maintenance capabilities for equipment.

This course focuses on practical case studies on how to create opportunities for transactions and monetization without necessarily investing large sums of money when capital is scarce or the business direction is unclear. This lecture summarizes the standards learned through hands-on experience in distribution, wholesale, K-beauty exports, buyer proposals, group buying, influencer collaborations, content marketing, and business development. We will examine why even good products or ideas often fail to lead to actual transactions and profits. From a practical perspective, we explain how to propose products, who to sell to, which channels to utilize, and how to structure deals. Many people get stuck in the process of connecting a good product or idea to actual sales and revenue. Execution often stops because people don't know who to pitch to rather than what to sell, where to find clients, which distribution channels to choose, how to set supply prices and commissions, or how to scale the business after the first sale. Over the past 12 years, I have also experienced numerous trials and errors while working in online wholesale, consumer goods distribution, exports, and business development. I found overseas clients starting with zero buyers, negotiated supply terms with manufacturers, expanded online sales channels, and connected influencers with sellers. I have personally experienced why good products don't sell, why customers don't come even after spending on advertising, why proposals are rejected, and how deals fall apart in the middle of the process. This course does not just show successful results. I will explain, with real-life examples, who I contacted first, what I proposed to the other party, under what conditions the deal was made, where problems arose, and how I restructured the approach after failure. The following topics will be covered continuously: I will introduce the process of discovering buyers and creating deals while exporting K-beauty products to the African market, methods for operating online wholesale and distribution channels, business development practices for finding and proposing to new clients, and local creator strategies for expanding restaurant accounts into sponsorships, paid production, and corporate advertising. We will also cover the structure of group buying brokerage, how to prepare influencer group buys, the process of connecting products with sellers and designing supply prices, commissions, and settlement terms, how to enter welfare malls and closed malls, and how to source products suitable for the market and propose them to manufacturers and distributors. Furthermore, we will discuss how to convert content from simple views into revenue, marketing cases that improve the advertising costs and promotional structures of small businesses, and the realistic decisions made to normalize business after experiencing sales declines, severed deals, relationship conflicts, and failures. I also plan to share the process of developing inconveniences discovered in consulting and business development into patents, MVPs, and new services and business models. The purpose of this lecture is not to deliver a business formula that looks like a "correct answer." It is to show the structure where actual transactions are created by discovering recurring problems in the market and connecting the people, products, content, and distribution channels that can solve those problems. Students can learn the criteria for re-evaluating their own products, experiences, networks, and local resources, and determining to whom and in what way they should propose them. We will look together at the process of turning vague ideas into actionable proposals, connecting those proposals to collaboration and sales, and developing small transactions into repeatable revenue models. I hope this serves as a realistic starting point that can be applied immediately in the field, not only for those starting a business for the first time but also for those who already have products or clients but are unable to expand to the next level, and those who want to turn their experience into a new revenue model.

For those who want to learn Entry but are having difficulty due to lack of accurate explanations, I have prepared a lecture that covers the basics of Entry. Anyone who has downloaded the Entry program can watch the lecture and follow along.

You can learn from the basics step by step using Entry. It is survival programming where you survive by solving missions with Entry in the jungle.

It improves logical thinking skills, fosters the ability to understand how to use programming tools, and develops the capacity to design algorithms for problem-solving.

Using block coding Entry, foster computational thinking and problem-solving skills, and through Entry AI tools, learn artificial intelligence concepts and practice simple machine learning.

Learn content that aligns with <Understanding Block Coding>, which is included in the mandatory curriculum designated by the Ministry of Education for elementary, middle, and high schools.

We have structured the content to help you understand production planning and process management, which are the core of production management, and to enable you to perform more efficient and advanced production management tasks, from building work systems that respond to the Fourth Industrial Revolution to utilizing systems.

We help you understand the components of productivity and learn various productivity measurement methods based on different types of inputs through diverse case studies. Through methods of analyzing and managing measured productivity indicators, you can promote productivity improvement.

Learn the core concepts and operating principles of Physical AI, which moves beyond the screen to be implemented in robots, autonomous vehicles, and drones. Understand the sensing-perception-action mechanism, digital twin-based learning, and the importance of embodied data, while exploring the global technological competition and Korea's strategic direction through real-world cases in industries such as manufacturing, mobility, and agriculture.