I am trying to give the flag kgenerators.mine.ores_generator to everyone. I know I have to use permissions.yml but I don't know what code to put. I tried "kgenerators.mine.ores_generator = true" but that didn't work.

Ok thank you... at least I know where to start now. Ig I just have to figure out how to use luckperms now

Make sure you write /minecraft:give to specify you're trying to run the Minecraft give command and not one from a plugin.  Essentials is probably trying to be helpful by stealing the vanilla /give from you.

Personally I recommend skipping Skript here and using a plugin which is designed for this sort of thing.  There's quite a few chat filter plugins, many of which support Regex.

For mild swearing I use ChatFilter by Ranull, because it allows players to turn it off client-side with a command.

For slurs and other instant-ban words I used to use GriefPrevention but I've lately switched to CMI.  In both cases there's a way to select certain words which, when said, get filtered out and then instantly ban the user.  GriefPrevention is free, CMI is not.  

Most experimental items actually do exist before they're properly released, I assume that's what's happening here.

Also, does falluppvp know you're using a hacked client?  You might want to let them know in case it's against their rules.