I found that, to italicize, you can also use underscore immediately before and after word(s) you want italicized.
Also, I accidentally found out another way to add thin lines to separate sections in your post. You can use *** (3 or more asterisks) in a line by itself and it'll create a section for the block to follow!
I looked up how to italicize words a while back but the thin line was discovered accidentally haha