Tagging in a Social Media App

How do I create a limited list of tags that can be applied to a post (I’m making a social media app using a template similar to Instagram) that then can be sorted into lists of categories? For example:
I set the tags #red #green #blue #gold. Then a user can select #gold for his/her post and then that particular post will appear in a list elsewhere in the app of every post labeled #gold.

Hello @alexanderwill64 welcome to the community!

Perhaps these videos can suggest an approach to take:

Thanks for the warm welcome and rapid response!

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