Hello! i am slowly progressing in game development but i keep forgetting stuff.

i can understand all the logics and code in the tutorial. i can basically understand pretty much 90% of code they say but when i sit down and decide to make my own stuff i just forget it. like i can make basic blueprints of the mechanics but i cannot write that down in the form of code. like for example i know how to make a chest open but i forget what APIs i should use (like transform,delete.destroy,and many more like that)

what can i do here?

( Like for example i can make simple games like flappy bird myself but i just forget when i should use the delete, loop,waspressedthisframe etc.)

is my problem that i cannot make a basic architecture for my code?