One of the best forums to post questions I find is stackoverflow, although make sure you post code with your question and ask a single clear question per post.

I am guessing you must have downloaded the official [LEGO] version of micropython https://education.lego.com/en-us/support/mindstorms-ev3/python-for-ev3 next to which you’ll find the official documentation too.

Search for large motor and you should find some answers.