Hi Christian. Thanks for sharing your questions with us. Sure, you can do this.
For example, this current community (community.tribe.so5) is a public Q&A community for our Tribe users like you. Also, because the community is public and the SEO Boost app is enabled in the community, many of the Q&As in this community have a good visit from search engines. Therefore, you can create a Q&A platform on Tribe and with the help of your SEO techniques and Tribe SEO features, you can get indexed on the internet as well.
You can learn more about SEO here16.
Some other articles that can help you with learning basic SEO techniques are here8.