Youtube shouldnt be your first stop. You should try to figure out what you want to do and break that problem down. Only when you are trying to figure out how to do a piece of that puzzle should you consider youtube. Take for instance, I want to make a platformer. What actions do I want my charcter to do? Move and jump. Ok, lets start with figuring out how to move a character. Here is where you can consider youtube. Ok you watched a video that shows you how to do it. But do you understand how it works? If not, break that code down and figure out what it does. Ok the code references a rigidbody, wtf is that? Use a search engine and learn about that component. Look at the things you can modify and change on it. Ok now you understand rigidbody, and your next task is to make the character jump. Maybe the knowlege you just gained is enough for you to figure out the problem on your own. If not, back to search engines or if you must, youtube. Eventually you will know how to do what you want based off of your experience.