Need a plugin to show user messages in a specific page

Hello All

I have been searching many hours now for a plugin, that can do as follows:

I need to create a page, where my users can write advices, tips and recommendations. The should just be able to write a message and post it on a page. No need for media attachments. I will then create these three categories, they can choose from:
Then other users will be able to comment it. I just need a plugin that can do something like that, so I can place it on a page.
Hope you got some suggestions.