Search projects in the upper left hand corner. Here is a super cute loft bed for a girl. https://www.hometalk.com/2075585/lofted-cottage-bed-for-our-little-girl-s-dream-room
Here's a link with a detailed plan:
Hometalk has a bunch of great DIY plans, take a look at this one. https://www.hometalk.com/33038510/diy-loft-bed-with-playhouse-reading-nook
One of my fave bloggers just built a loft bed and it looks fabulous: https://blog.jennasuedesign.com/2020/01/diy-loft-bed/
Here is some information to help you.
There are a lot of great plans over on www.ana-white.com!
These are all good, and as you read them, consider that the Load is kinetic, not static.
If it’s for adults, then a kid-bed set of plans will fail.
This is a very cool build...https://www.hometalk.com/39120777/a-diy-suspended-loft-bed
There are lots of ideas here: