How do you unlock weapons in gta online?

The Wikipedia entry for Grand Theft Auto Online gives an overview of the game’s setting, multiplayer structure, and basic gameplay features. It explains that the game is the online component of Grand Theft Auto V, set in the fictional state of San Andreas, and that up to 30 players can explore the open world. However, the article does not mention specific mechanics for acquiring or unlocking weapons in the online mode. Consequently, the source does not provide instructions or details about weapon unlocks. To learn how weapons are unlocked, one would need to consult additional official guides, the game's manual, or community resources.