How to set tags that must be select
AI-generated summary
The discussion is about Mandatory tagging for topics. qiancsf wants to know how to set tags that must be selected. ondrej explained that required tags can be set up by navigating to the category setting page and selecting ‘Tags’ from the menu. However, qiancsf clarified that they want users to be forced to create or select tags themselves. denvergeeks provided a link to relevant documentation. Moin noted that admin and moderators are exempt from required tag rules. ondrej added that, by default, non-staff users are not allowed to create tags, but this can be changed via site settings.
Hello @qiancsf 
You can set up required tags by navigating to the category setting page, selecting ‘Tags’ from the menu on the left and then looking for the setting below.
You must have a previously created a tag group to add a group to the setting above. Here is the documentation to create/configure tags if you are unsure.
I’d recommend reading through the Documentation category as it answers most user questions 
What I want to express is:
Mandatory, users create or select tags themselves
The rules of required tags don’t apply to admins and moderators, so you need to use another user to test your configuration.
Set the default navigation menu categories to: Uncategorized
After this setting, it is not mandatory for users to create or select labels themselves
Only default navigation menu categories cannot be set,
After this setting, users can be forced to create or select labels themselves
As a side note, by default, users that are not staff aren’t generally allowed to create tags however, this can be changed via the create tag allowed groups site setting.