Hii, so I've been writing a few guides but I kind of got a little confused.

I only started writing guides very recently and I'm still fairly new to it so I ran into a problem.

What stuff does a good guide have?

In my most detailed Sona guide I have fairly enough of stuff (at least I think so): from abilities, runes, tips to warding and laning phases but I'm unsure what else I could add to it.
When I check other guides they always seem really detailed to me and I just can't think of anything else to add.

Could someone maybe leave some tips to me or suggest what people add to guides to make them as detailed and helpful as possible?
Thank you :)