I imagine what I want it to do at its core and what I need. Then research and get to work!

Started building a YouTube downloader using nficano's Pytube library.
I know there are a ton of them out already, but I am doing this to learn some Python and nuances. I tried YouTube-dl but that's more cli oriented and I've already built cli GUI wrappers before.

So the key I think is persevering even if it's already been done. By building this I'm learning tkinter, Python in general, and when I try to build this into an executable (so the user won't need to have Python) I'll learn how that works too.