Post Installation

App stores

Prioritize Obtainium. Many app configurations for Obtainium can be obtained here,

Use the Graphene native store to install the Play Store might you need it, and also to keep Graphene apps up to date.

Accrescent has some cool stuff like AppVerifier, Molly, IronFox, etc. You can get it from the Graphene app store.

F-Droid is also an option but I don't use it (until Schildichat forced it onto me). It has some flaws, which aren't that bad, but they exist.

As a last resort, there is the Play Store. Note that in Graphene land, the Play Store app has as much access to the system as any other app, which is not a lot. Read more here: Sandboxed Google Play