Simple, just remove edit_terms from their permissions. You can use something like https://wordpress.org/plugins/wpfront-user-role-editor/
This will lock only tag creation or other things?
If you have custom terms that use the same capabilities as the default tags they those will be locked up as well. You have to be careful and know your system inside out. If you only have Tags and Categories like in a default WordPress installation then it will work without any issues.
Ok but i can try, right? I can try to disable edit_terms and see if any other things is locked: if yes i will restore the permission 🙂
There’s nothing stopping you. You can try 🙂
ok thanks i will try and if i’ll have problems i’ll come back there searching for you 😛 haha thanks for your support mate, really appreciated 😀 have a nice day!