I have tried to set up the Raidable Bases Plugin, but I don't know much about configuration. Can someone help me? I've seen some tutorials, but they didn't work for me. It's for a server where my son and I can play.

heya. tutorials are the best way to learn. this is a very complicated plugin so you will have to pay close attention to everything
I have a few packages that have everything preconfigured but you are still required to make changes specific to your servers needs
links are in the top of the documentation

I followed the tutorials to the letter. Some had different things; I think it could be the updates because they were from 1 or 2 years ago. But something I couldn't find is the COPYPASTE file in Data. And when entering the server and typing /rbe, it gives the error 'No valid buildings have been configured.'

Merged post

Could you recommend me a tutorial that is updated for this version of the plugin?

the tutorial linked in the description is sufficient to setup the plugin. some information is outdated, and many new options have been added since, but the general setup is largely unchanged. I'm not aware of any other tutorial.

copypaste files must be added to the oxide/data/copypaste/ folder

that folder is case sensitive and must be lowercase

add those copypaste filenames to your profiles