there are many different aesthetics out there. here are some of the most popular aesthetics:
1. grunge.
this aesthetic is based around dark color, fishnet, hoodies, and other things like that.
2. soft.
this aesthetic has lots of pastel colors and is bright and colorful.
3. retro.
this aesthetic has lots of neon colors and it based off of the 80's or 90's.
those are just some examples of popular aesthetics, but you can do whatever. if something you like doesn't fit into a particular aesthetic, then you can make it work anyways and it'll look great.