How do i move forward?? Please help

I watched a 5 hour video on cpp, python, html, css (on different occasions). I learnt all the syntax basics, and other stuff like variables, functions, etc. I heard that there is something known as data structures and algorithms. i decided to learn that side by side. I didn't know what to do other than that. I learnt something. But idk how useful it would be. I feel like i am hitting a wall after the video. What do i do with t