I did everything from the tutorials https://www.gameserverkings.com/knowledge-base/rust/oxide-permissions-101/

But it doesnt show VIP tag when I add someone to the vip group. What am I doing wrong?

There are no chat tags without plugins. Adding a user to a permissions group doesn't do anything other than add them to that group and inherit any permissions tha group has. Other plugins can make use of the permissions/group system to do things such as add chat tags.

For chat tags, you'd need to use a plugin such as Better Chat.

Thanks, im working with beterchat and clantags plugin to make it work.

By the way: in your tutorial it says you do have tags

Setting the title or rank of a group

I got one more question: I am trying to make vippermissions and I can find how I grant a permission, but not how I actually create a permission.

I try:"oxide.grant group vip vipperms

but then it says Permission vipperms doesnt exist

Permissions are generally registered by plugins.  If you don't have a plugin which registers a permission "vipperms" then it won't exist.