[CS Technical Interview Part 2] Operating Systems Made Easy

🚀 Introducing the second lecture [Operating Systems] from the Technical Interview Master Roadmap.

📕 Operating Systems, the Core Key for Developers!

Operating systems are the key to understanding how code written by developers actually runs on hardware, and an essential subject that deals with "how computers work."

• Still confused about the difference between processes and threads❓

• Is it difficult to clearly answer which resources among code/data/stack are shared by threads❓

• Is it difficult to clearly explain what virtual memory is? Deadlock? Deadlock❓

If just seeing the word gives you a headache and you break out in cold sweat when it comes up as an interview question?

This course is designed specifically for those people, providing a clear and comprehensive overview of core operating system concepts through diagrams, flow-based explanations, and practical applications. No more feeling overwhelmed!

🎯 Through this course, you will be able to clearly answer the following questions.

• What does an operating system do in a computer?

  
  → Structurally and clearly explains the definition and functions of an OS, as well as its relationship with hardware.

• How are processes and threads different, and how do their states transition?
  → We'll cleanly organize complex concepts including confusing state diagrams, context switching, and multithreading with clear diagrams.

• How does the CPU select processes?
  → Intuitively compare and analyze the principles, advantages, and disadvantages of various CPU scheduling algorithms such as preemptive/non-preemptive, FCFS, SJF, round robin, etc.

• Why does Deadlock occur and how can it be resolved?
  → Learn in-depth through various cases including resource allocation graphs, deadlock occurrence conditions, and avoidance/prevention/detection and recovery methods.

• How does virtual memory work?
  → Explains paging, segmentation, page replacement algorithms, and more with rich visual materials so that even non-majors can understand.

• How are disks managed and scheduled?
  → We clearly organize the various scheduling techniques of disk I/O and the components of file systems by connecting them to actual structures.

📌 At the end of the course, a practical interview practice chapter awaits you.

"What is deadlock?", "Please explain examples of scheduling algorithms", "Why is virtual memory necessary?" - for core questions that frequently appear in technical interviews like these, you can now practice answering them smoothly on your own in just one or two sentences without hesitation.

📖 A curriculum packed with only the essentials

This is the table of contents and key keywords you will learn in this course.

If there are any unfamiliar keywords, make sure to grasp them thoroughly this time.

💡 Non-majors can also succeed in developer jobs - CS is the key!

"I thought it would be over once I passed the coding test. But it wasn't."

I too, when first preparing for a developer job, was obsessed only with algorithms and coding tests. I gained some confidence and passed most coding tests. However, I kept failing at the next hurdle - technical interviews.
What was the problem?

It was precisely the lack of CS (Computer Science) knowledge. In interviews, CS fundamentals were considered much more important than algorithms. However, there was no need to dive deep into every CS subject. There were separate core CS concepts that frequently appear in technical interviews.

This course is a roadmap that systematically organizes those scattered core CS knowledge pieces. For those who, like me as a non-CS major, experienced frustration, I've clearly organized complex CS theories with a flow-centered approach. Furthermore, I've included core question practice chapters to help you develop the 'ability to explain' required in technical interviews. Now it's time to transform into a real developer through complete CS mastery.

You'll learn this kind of content

👀 Course Preview

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🖐 Hello! Let me introduce myself! 🙇

I created this course thinking of my past self who stayed up all night worrying about fundamentals and had my heart racing over a single interview question.

I started as a non-CS major and understand better than anyone the thirst for fundamentals (CS knowledge, programming languages, etc.). Through self-studying countless materials and building my own know-how, I eventually graduated from Seoul National University and now work as a 🧑🏻‍💻 Kakao developer.

Since childhood, I've been more confident than anyone in combining and reconstructing various materials to create 'my own comprehensive study notes.' This lecture is precisely that secret notebook born from my 'ultimate self-study know-how' and all my passion and philosophy.

🔥 What makes this course special?

• All of my 'know-how' is included: As a non-CS major, I have fully incorporated my experience and know-how of self-studying CS and programming languages and getting hired at a large corporation. I have included in this course all the methods for how to most efficiently understand complex and abstract concepts and make them your own.

• 'Fundamentals' are key in any development field: Whether you're aiming for game development, AI, web/app development, or any other field, basic computer science knowledge is not optional but essential. This course helps you become a true expert based on solid fundamentals.

• We compete with 'overwhelming quality': I've referenced countless materials including textbooks, famous university lectures, commercial books, and technical interview resources to extract core keywords and reconstruct them in my own unique way. With intuitive diagrams and illustrations, plus easy explanations infused with my practical experience, I promise to make even complex concepts click with that "Ah, now I get it!" moment.

  
  

🗣 Real Interview Practice: Why is 'Speaking Practice' Important? (My Vivid Experience)

Let me share my experience with you. In an interview at a certain company, I was asked a question about floating point. Even though I had read about it multiple times in books and thought I understood it, I couldn't utter a single word. I painfully realized that passive learning - simply reading and understanding - wasn't enough to answer questions in a real interview.

You've probably experienced this at least once. You definitely studied and understood well, but because you didn't organize individually and practice 'speaking', all that effort was useless in real situations.

To succeed in interviews, you need not only to accumulate a lot of knowledge but also the ability to explain this knowledge. This 'ability to explain' can only be developed through practice of organizing concepts in just a few sentences and speaking them out loud. Through this process, you can also discover what you didn't know precisely.

My course doesn't miss this crucial point. After learning each core concept, we'll practice together in the 'Interview Practice' chapter where we practice summarizing in a few simple sentences that fit the interview format. Through this course, I will personally help ensure that your knowledge shines in front of the interviewer. ✨

💡 Curious about other interview preparation courses? Check out the roadmap below :)

Pre-enrollment Reference Information