This is the official Lemmy documentation for text.
I don't think indented sub-items are possible in a list, but there may be some wizardry I'm unaware of.
Tables are possible, but can be confusing. You might find this helpful.
what is the “URL” field at the top of this post for?
That's if you want to share a link to a news article or video or something, rather than create a discussion post. Your post will automatically provide a link to that URL, and will also try to generate an appropriate title that you can use if you want (generally by grabbing the title of the page you're linking to).
How do I make “minor separations”, where you have multiple paragraphs, then a paragraph with more white-space between it, but not like a header or a line. It’s related enough that I want it connect, but separate enough that I want some separation
I'm not sure if it's exactly what you have in mind, but I find a triple dash to be a good minor separator.
How can I make Paragraphs have indents? (I know they aren’t needed grammatically anymore, but in some cases, a paragraph just doesn’t seem “right” without an indent…
I don't actually know if this is possible...