I use a Nitrado Minecraft server that has the following plugins on it:
Antibuild, essentials, lp, playerplots (I read out the plugins that could be important).
The problem and cause of the question is: when a new player comes onto the server, you have to give them rights so that they can remove them.
How can I fix it so that the player can work in the areas where he can also use Op?
Which hoster you run your server on does not matter at first.
Important plugns are e.g. Essentials, essentials buld, essentitals protect and essentials chat, worldguard, worldedit, Multiverser, a rights plugin like luckperms, bpermisions or pex and a property plugin like Plotsquared or griefprevention. All others are more cosmetic.
The correct configuration of a plugin is important and, above all, no one except the owner may have OP rights, otherwise you have had a server for the longest time.
The GS plug-in, worldguard, essentials and rights plug-in are decisive for building rights. There's a WIKI for every plugin, you just have to read it.