Brewery is for making drinks and alcohol, I dont have the recepies anymore but I have the config file from which you can find out what materials needed for what drink. I think there is a tutorial built somehwere in the old world, maybe if you do a /warps then there will be a warp to that place.
Coreprotect is for rollbacking blocks in case of major niggering
Multiverse and all of it's kind is for having multiple worlds
vauilt is needed for worldedit, I dont know what it does desu
luckperm is for managing permissions of plugins and commands