Greetings. I recently tried to test whether permissions work properly, but I couldn't seem to be able to interact with anything. For example, I couldn't eat steak and I couldn't interact with an Oak sign. The error that is throws is: You are not permitted to use/interact with . Thanks for your help!

LuckPerms itself doesn't restricts anything. You can use the Verbose feature to see what permissions are being checked, and so what permissions you have to give yourself.

Thanks. I will try that now

The issue you encounter is most likely with WorldGuard.
WorldGuard does to my knowledge not use permission, with the exception of bypassing flags.
You have to set the flags of the region to allow the actions you want.

But this is for sure not an LP related issue.

Slaps self. Sorry for wasting your time. I forgot to allow essentials.warp.* and essentials.build.*