Bricks are crypto just like Moons are, they're not quite worth as much though, 6 cents each or so the last time I looked. These crypto tokens are smart contracts on the Arbitrum Nova network, which is itself a layer on top of Ethereum. If that all sounds a bit complicated, that's because it is. Selling is a bit of a chore. It looks like there are services under development to make it easier, but of course those services will act as a middleman and probably take a bit of profit along the way.
In your Reddit Vault Settings, there is a way to extract your Recovery Phrase. This is a way to access the crypto wallet inside your Reddit account in a standard form. You should save it in a safe place, on paper. Using that phrase in crypto wallet software will enable you to transact without needing the Reddit app to do so.
But be careful! That phrase is like your crypto bank account, credit card number, SSN, and mothers maiden name all in one package. Anyone with access to that phrase can access your assets in that wallet. Dont use it in anything electronic until you are looking to sell. In the unlikely event hackers gain access to your personal files (on the cloud or your PC), they know what Recovery phrases look like and can use them to steal your funds.
Regardless of whether you intend to sell or not, it's a good idea to save that phrase, so it gives you the option in the future, even if Reddit dies.