Make someone an admin or moderator

ownerid 76561198000000000 "Name" "Owner"
moderatorid 76561198000000000 "Name" "Mod"
server.writecfg

Owner gets everything including F1 spawn commands. Moderator gets the moderation tools without item spawning, which is what you want for most staff.

For finer control, Oxide has its own groups: oxide.group add staff, then oxide.grant group staff <permission>. Plugins define their own permissions and list them on their uMod page.