The idea is to not just watch the video but open VS code and follow the steps, or even try to put your own logic before you are shown how a specific task is handled. And ofc try to understand what happens, and if you dont, look up further online on the matters that didnt make sense, or included bits the guide did not explain just.
After ive followed both guides and made the small example projects, ive alreayd had the experience of coding those small tasks and later, when i started working on a project of my own and had intention to include a submenu, an image slider, or another functionality, i had already an idea how those things could be handler. I also knew a source where i can quick check and refresh my memory on how to do it. Some things i could even come up on my own and further develop according my needs.