Open Garage from the interaction menu, or press F3. Store vehicle puts your active personal car away. Your active personal vehicle also shows a Personal vehicle blip on the map.

From Garage you can spawn your active car or use Deliver nearby when it is already out. Repair is available there too when you need a quick fix.

Garage capacity starts small. Buy extra slots from the garage menu when you own more cars than you can store. The menu shows the next upgrade and its cost.

Sell vehicles you do not want from the garage menu. Lock and unlock your personal vehicle with U so random players cannot hop in freely.