Title. I've been trying to set up a 2 people server for me and my brother to play together, but my efforts of making the glasses unbreakable (for using gun mods) and blocks indestructible by explosives (grenades) have been wasted. I've tried setting up permission for user [my own username] then deop my player, but I was still able to destroy said block in said selected zone. Can anyone give me an indepth guide?

Which version of FE are you using? And how did you setup your permissions?

I'm using the lastest version, and I'm currently setting up my permissions via opping my ingame character and use /p group/user

Latest version from where? There are two major Minecraft versions supported and two sources to get the mod from. Again which version are you using?

For setting up users, please provide your exact command and/or permission files as stored in ./world/FEdata.

forgeessentials-1.10.2-10.3.1375 for minecraft 1.10.2, sorry for not classifying

I used /p group ALL deny fe.protection.break*

That denies everything to break anything anywhere. I suggest you dive into https://github.com/ForgeEssentials/ForgeEssentials/wiki/Permissions-tutorial

In case you need to discus anything that's not on the wiki or to be found in the issues, feel free to join https://discord.gg/FNRQjmr

yeah I'm trying to do that but after doing that, I myself was still allowed to break blocks...