I learned a lot from many sources, #Stackoverlow, random blogs #GeeksForGeeks, #mCoding on Youtube has a few low level explanations.
But honestly, I love documentation. I lie in my bed and can just read an entire library's documentation top to bottom, and my favorite is the #Python official documentation.
I probably read through it once a month. It acts as a great refresher, but I also notice something new every time.
I use the documentation constantly during development, and it is always open in my browser.
Edit: oh and #w3Schools of course, but that was in the beginning
#stackoverlow #geeksforgeeks #mcoding #python #w3schools