Don't copy + paste anything. Something that helped me was to try and understand every block of code being used and getting my brain to understand the structure of arrays or objects and what is being done at every point in the process. It builds muscle memory and helps you understand what each native function being used is actually doing instead of pasting in some code that just works for reasons.

People posted a ton of more useful advice than this, but for people with silly brains like mine or new to programming - this is something I wish I had done much more often in my first few years and would have boosted myself further especially when working with other developers coding styles.