While learning any programming language, you have to practice Problem Solving What is this and where do I find it? Simply, these sites ask for output from you, and you try to write a code that shows this output, and at the end, you do a test, and the site checks your answer through Sample Tests. I will write in the last post sites. Real problem solving will expand your thinking and develop software logic, and of course, there are a variety of these questions, including the ones you will need in your job, and it will save you a lot of time when you work because you have solved a lot, and there are also types of questions that may be related to mathematics and thinking, but by the way, they are all useful. And here is an important question Can I do Problem Solving during learning? - From my point of view, uh, you can, after you finish the lessons of the functions, all the time because all the issues must be within the function. And if you are still in the language learning period, you will surely find questions that you will know how to solve, and you will also see how to solve them. Ok, so what did I benefit from? - No, you benefited a lot, because when you reach this need in the course, you will have an idea about it, and therefore you will be able to quickly understand the idea. The purpose of the post is that Problem Solving, during the learning period, will consolidate the information in your brain, and you will understand what is necessary for every need. There is a need for Bonus, so reading will also help you a lot, because the topic is a little different from the video and there is information that is not in the video There are many sites for Problem Solving, such as - Codewars --Top Coder And others, and I honestly recommend Codewars because there are levels from very beginners to professionalism. I mean, if you are a beginner, enter the site and choose 8 kpu level questions and you will find yourself starting to understand, God willing. And then, before that, watch the videos of Elzero Web School, the playlist for Problem Solving, to understand how does it work. Regarding book recommendations I recommend reading: Clean code and as for JavaScript: Eloquent Javascript