How to sell and buy vehicles in gta online?

The Wikipedia excerpt supplied only gives a general overview of Grand Theft Auto Online, describing its release dates, platform availability, and the fictional setting of San Andreas. It mentions the game’s multiplayer nature and open-world exploration, but it does not provide any details about in-game mechanics such as purchasing, selling, or trading vehicles. Consequently, there is no verifiable evidence available in the provided source to explain how to buy or sell vehicles in the game.