I have no clue how to use HTML!!

Hello!!! This is a silly first post. Anyways, I plan to post fanfics here on this website soon; however, I am not that well-versed in HTML!! I suppose I'm wondering if anyone has any tips for any places for a general starting point to learn? I also would love to know how to format a basic fanfic.

Anyways, I'm going to bed after I post this, so any replies I will get to tomorrow!