[CS Technical Interview 3] Network that gets you talking
yiyj10305235
A course where you can understand core network concepts and train to explain them verbally for interviews.
Beginner
Network, Tech Interview, computer-science
A course where you can understand core data structure concepts and train to explain them verbally for interviews.
418 learners
Level Beginner
Course period Unlimited
Reviews from Early Learners
5.0
유세빈 (SebinU)
I like how you deliver just the core points in a straightforward way! It seems perfect to listen to for reviewing right before an interview 😊😊
5.0
100and
This is a great lecture for learning the overall structure of data structures. It's compact but contains all the key points, which made it excellent!
5.0
aerolbn
I believe data structures are the foundation and the flower of computer programming. I think this lecture is very well organized, focusing on the essential core content of data structures, which can be vast and difficult to organize. Thank you for the excellent lecture. ^^
Understanding Core Concepts of Data Structures
The ability to explain verbally in technical interviews
Practical Workbook PDF for Preparing for Follow-up Questions
1. When answering with confused concepts
❓Interviewer What are the characteristics of object-oriented programming?
💬 Candidate It's the SOLID principles. First, S stands for......(omitted)...This is a situation where the characteristics of object-oriented programming (abstraction, encapsulation, inheritance, polymorphism) and
the object-oriented design principles (SOLID) have been confused.
This can give the impression that the framework of basic concepts has not been established.
❓Interviewer: What are the characteristics of TCP?
💬 Candidate: It is a protocol that guarantees reliability.
❓ Interviewer: What are the mechanisms that guarantee reliability?
💬 Candidate: Uh... well... it's like... making it transmit safely... sort of...This is a state where you only know the superficial definition and are not prepared to explain the principles.
If the 3-way handshake, sequence numbers, ACK, retransmission, flow control, and congestion control
are not connected as a single flow, you will inevitably get stuck during follow-up questions.
❓Interviewer: What is HTTP?
💬 Candidate: Uh… it’s for… sending and receiving data on the web…?It is a very familiar concept, but when you actually try to explain it in a single sentence, the words don't come out.
This is not a lack of knowledge, but a lack of experience in organizing and speaking it out.
1⃣ CS notes organized specifically for interview preparation
Concepts and principles that must be checked before an interview are gathered together and provided as lecture materials.
While building a solid foundation, it is structured so that you can keep coming back to it right until the moment of your interview.
It is not just a simple summary, but includes diagrams and easy explanations so that even non-majors can fully understand it.
Computer Architecture Lecture Material Example
2⃣ Appendix | Interview Practice Materials Provided
In interviews, the ability to explain clearly is much more important than simply knowing the information.
However, organizing and practicing on your own is a difficult and tedious task.
At the end of the lecture materials, we have included "answering in one or two sentences" training to save you the trouble of organizing it yourself.
Example of Database Lecture Appendix
3⃣ Preparing for follow-up questions Technical Interview Practical Workbook PDF provided
"Will this lecture alone really be enough for speaking practice?"
After much deliberation over this concern,
I have created a technical interview practical workbook.
It is designed so that you can practice speaking just like a real interview on your own.
You can find detailed information on the structure and usage of the workbook in the workbook introduction video at the beginning of the lecture.
Operating System Workbook Example
4⃣ A CS learning app for reviewing anytime, anywhere
To ensure you don't forget the core concepts learned in the lecture,
we provide a dedicated mobile learning app.
You can naturally review by repeatedly studying quizzes and core concepts during your commute or even during short breaks
.
1⃣ Download the materials and learn the core concepts while listening to the lectures.
2⃣ Take your own notes on the important parts to create your own CS interview notes.
3⃣ Save them on your phone and review them briefly whenever you have a spare moment.
If you are facing an interview,
if you are short on time → Quickly sharpen your interview instincts with the Appendix [Interview Practice] in the lecture materials.
If you have enough time → Complete your speaking practice like a real interview with the Technical Interview Practical Workbook and Mobile App.
Non-majors, job seekers, career changers, etc., who are preparing for technical interviews and need to be able to explain CS fundamentals verbally.
CS majors who need to organize their knowledge again

I have studied it before, but
I don't even know where to start organizing all that CS knowledge again
Don't open those thick textbooks
again.
We will clearly organize only the core concepts.
Non-majors who feel overwhelmed by CS

I'm preparing for a technical interview for the
first time and feel overwhelmed
not knowing where to start
By following the roadmap,
you can focus on learning
only the key CS core concepts.
Job seekers looking to change careers with limited time

Forget that, I don't have much time.
I need to
quickly summarize only the CS topics that appear in interviews.
There are lecture materials and interview chapters that allow for
quick review
even on your own.
A truly helpful lecture.
Already proven by 5,000+ students.
⭐️⭐️⭐️⭐️⭐️
1. A lecture where you can see how much the author has thought and agonized from the student's perspective (it seems the flow of the learner's understanding was well-considered)
2. Easy to understand due to diverse visual materials and examples
3. When learning new knowledge, previously learned content is mentioned and recalled to connect the information. As knowledge connects, the big picture is formed.
4. The depth of knowledge is not shallow. I'm taking the Operating Systems course right after Computer Architecture, and the synergy is great.
5. It perfectly scratches the itch of wondering "why" & "why we use it."
ps. I feel sorry for the author, but.. it's a lecture I want to keep all to myself.
- 'Operating Systems' Course Review
⭐️⭐️⭐️⭐️⭐️
Even with the short lecture time, I love how you clearly explain only the important parts. Since it's mostly a theoretical lecture, I didn't expect you to cover SQL queries, but I really liked how you showed examples for basic syntax and writing queries one by one. After that, the sections on joins, normalization, transactions, indexes, data optimization, and security were all great. Although I haven't taken other paid courses yet, the last lecture appendix titled "Interview Practice" provided actual questions and answers, making it great for self-study and practice. Since the lecture time isn't too long if you stay focused, I think I'll watch it a few more times. Thank you.
-'Database' Course Review
⭐️⭐️⭐️⭐️⭐️
The core content was explained clearly and with a logical flow, which helped me quickly organize my understanding of data structures. Thank you for the great lecture.
-'Data Structures' Course Review
⭐️⭐️⭐️⭐️⭐️
Wow... this is seriously so good...;;;; I need to save up and buy the entire roadmap.. I'm curious if you have any plans to teach Spring as well.. I'll buy it immediately..
-'Java and Object-Orientation' Course Review
⭐️⭐️⭐️⭐️⭐️
This is a lecture where you can set aside about a day to organize the key concepts of JavaScript all at once! It's great for a quick reminder before an interview👍
-'JavaScript' Course Review
⭐️⭐️⭐️⭐️⭐️
As a non-CS major, I was worried about how to study CS knowledge, especially computer architecture and operating systems. However, the amount of content was appropriate, so I could learn without feeling overwhelmed, and it was great because it felt like getting private tutoring from an expert. I plan to take the operating systems lecture as well, and I'm looking forward to it. Thank you!
-'Computer Architecture' Course Review
As a non-major, I initially focused solely on algorithms and coding tests while preparing for my first developer job.
I gained some confidence and passed most coding tests, but I repeatedly failed at the next hurdle: technical interviews. What was the problem? It was the lack of CS (Computer Science) knowledge.
I understand the thirst for fundamental skills (CS knowledge, programming languages, etc.) better than anyone. I built my own know-how by digging through countless materials on my own, and eventually, after graduating from Seoul National University, I am now working as a 🧑🏻💻 Kakao Developer.
Since I was young, I have been more confident than anyone else in combining and reorganizing various materials to create my own 'summarized notes.' This lecture is the secret note that contains all that know-how and passion.
Are you still confused about when to use a stack versus a queue?
Do you feel lost on how complex data structures like trees or graphs are applied to real-world problems?
This is the table of contents and key keywords you will learn in this lecture.
If there are any unfamiliar keywords, take this opportunity to master them once and for all.
Data Structure Overview
Classification of data structures, time complexity and space complexity
Arrays and Lists
Pros and cons of arrays, pros and cons of lists, various types of lists
Stack and Queue
Stack, Queue, Deque
Hash Table
Hash functions, collision resolution methods for hash functions
Graph
Types of graphs, implementation of graphs, graph traversal (BFS, DFS)
Tree
Types of trees, binary search trees, binary tree traversal, AVL trees, and Trie data structures
Heap
Heap operations, heap implementation and usage, priority queues
[Appendix] Interview Practice
Reviewing key concepts once more in a Q&A format
Visualizing the basic structure and operating principles of each data structure, such as arrays, lists, queues, stacks, hashes, graphs, trees, and heaps, through diagrams
Structured so that even beginners can understand how data flows as if looking at a picture.
Explaining the principles of heap operations with illustrations
Comparative analysis of each data structure's pros and cons, time complexity, use cases, etc.
Presents both
practical sense and criteria for solving algorithm problems on which data structure to use for each problem situation
Comparison of time complexity and space complexity
Learn key data structures along with manually implemented code
Rather than a simple listing of features, it follows the implementation flow and points out
why it is designed this way and what logic is required for which operations.
Implementation code for heap operations (Python)
Implementation of a Queue using a Linked List
Implementing BST insertion using a recursive structure
If the video is frozen, please refresh the page :)
Explanation of key operations in a Binary Search Tree
Explanation of heap operation implementation
Provided learning material format: PDF
Python (Python)
It's good if you have experience learning a programming language.
Who is this course right for?
Beginners who have tried coding but find data structure concepts confusing or lack confidence in them.
Job seekers and career changers who want to quickly organize data structure concepts ahead of a technical interview.
Those who get stuck on data structure selection criteria or implementation methods while solving algorithm problems
Those who feel that structures such as trees, graphs, and heaps are too complex
Need to know before starting?
It's great if you have experience learning a programming language!
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32
Answers
4.9
Rating
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Courses
Education and Experience
Graduate of Seoul National University
Current Kakao Server Developer
Course Introduction I am creating the "Fluent CS" series to help you articulate CS concepts during interviews. Course Philosophy Having started development as a non-computer science major, I understand the importance of CS...
Course Introduction I am creating the "CS for Speaking" series to help you articulate CS concepts during interviews. Course Philosophy Having started development as a non-computer science major, I...
Course Introduction
I am creating the
CS Speaking series to help you articulate CS concepts during interviews.
Teaching Philosophy
I started my development career as a non-CS major and went through a lot of trial and error while personally organizing everything from CS fundamentals to technical interviews. Based on the learning methods and conceptual organization know-how accumulated through that process, I create content that makes core concepts encountered in practice and interviews easy to understand through illustrations.
"I am creating the lectures that I needed back then."
Blog yiyj1030.tistory.com → Running a tech blog that simplifies CS, algorithms, and practical concepts. Contact yiyj1030@gmail.com
Blog
yiyj1030.tistory.com
→ Running a tech blog that simplifies and organizes CS, algorithms, and practical concepts
Contact
yiyj1030@gmail.com
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32 lectures ∙ (3hr 14min)
Course Materials:
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The data structures were well-organized overall, making this a helpful lecture for studying. Thank you!
Thank you for the course review. I hope this lecture isn't the end and that we can continue the learning journey together. I look forward to seeing you again in the next series :)
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Average Rating 5.0
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