Places that only exist for apps: store nominations, in-app events, public betas and app communities.
Open a public beta link for up to 10,000 testers and post it everywhere else on this list. Early testers become your first users.
What to test: Tell testers what changed and exactly what kind of feedback you need.
This one lives inside the store or an app community, so it only applies to apps. In the workspace, Groivo gives TestFlight public link its own App Store campaign link (ct=) and Google Play referrer, so downloads from it show up in App Store Connect and Play Console.