Possible use tags in clubs? 

The content items in clubs allow tags, as normal.  

The clubs themselves don't allow tags, but you can add custom fields.  

4 hours ago, Joel R said:

The content items in clubs allow tags, as normal.  

Thank you, I can see it. But there no setting for predefined tags?

On 11/28/2019 at 1:17 PM, Joel R said:

The content items in clubs allow tags, as normal.  

The clubs themselves don't allow tags, but you can add custom fields.  

I can see the extra fields option, but it can't apply for Forum topic use, or I missed something? 

I don't want to create 12 forums in one club for 12 grades of students groups. I think if I can set 12 tags for differents grades, then parents can open a topic with a tag of grade, resolve the topic classification problem.