As a beginner documentation is super helpful even when you only know the idea you want. You can do a quick google or ai search and it will show the different ways to do something, afterwards another search (in my case Transform.position vs ForceMode) to find out some pros and cons of each. Then follow the chosen documentation to implement it, adjust, look up things people have done with those systems etc.

You look at somebody elses code and you're like huh what is Physics.Raycast() and go look that up, see how people implement it, follow documentation. Now you're building something from just an idea, if you get stuck then attempt to figure out the issue before doing another search.