also if you want to emphasize tags use {} like {orange hair} or deemphasize it with () like (snow) if you find one tag overpowering the others.
FYI that's just novelAI's UI implementation, if you're using the NAI model (or whatever) with webUI it's () to add emphasis and [] to reduce it.
You can also ((((stack)))) em or add specific weighting like (this:1.4) for even more precision. In webUI you can just highlight a tag and hit ctrl + up or down to tweak them, too.
But order still matters, so an unbracketed token as your first term might have more impact than a bracketed one at the end. Although putting them at the end can still be a better idea in the case of long prompts, because as I mentioned before anything after 75 tokens gets appended with an AND so you want to try to have nonspecific style tags (like lighting, backgrounds or artists--possibly, depends what you're trying to do) at the end and use brackets rather than bumping them up if it means something more important would end up after the 75 soft limit.
Also while booru-style tags definitely works well, I find that grouping them in short clauses can be very helpful if you need to keep terms related. For example "scared (confused) girl with (long braided black hair) sitting on bed, boy standing (offering bowl of eggs)" followed by all your other assorted tags will probably work better than "1boy, 1girl, bed, bowl of eggs" etc for obvious reasons. So don't be afraid to mix and match.
Edit: also if you see {curly|braces|with|piped|terms} in people's prompts that's a random prompt selector. There's a couple scripts but I use the dynamic prompts one, which gives you that plus picking random terms from __wildcard__ files, and adds a pick N syntax which lets you do stuff like {2$$one|two|three|four} to pick two random tags from your list.
...And whatever, while I'm at it there's also [::] syntax which lets you remove or swap a tag partway though processing your steps, like [foo:bar:10] which would swap foo for bar after 10 steps or [:banana:0.5] which would make bananas kick in at the 50% mark.