Personally I used CodeCademy to learn the basics and rely on W3Schools to get a reminder of the correct syntax to use when I am not sure. Do not hesitate to Google what you are trying to achieve if you suspect that something already exists to do so in Python's built-in methods. I cannot speak for everyone there but this is what worked best for me so maybe it will suit your learning style as well !

Dude im so confused. I pass the test but my attempts i get half of them incorrect. But when I check the answers on a interpreter, it gives out the correct solution?

Just when I think I did good, someone else does it in one line TT

how do you actually know all of this stuff