Introduction
GTA stands for Grand Theft Auto, this feature allows you to steal cars which will be moved into your Garage.
By stealing cars you'll be gaining car jacking experience, you'll be unlocking your way towards more valuable cars.
Once you've successfully stolen a car it'll be moved to your garage where you can choose to sell the cars whenever you want.
Stolen cars will have a random amount of damage on them, the more damaged a car the less value it'll sell for, every night at 00:00 server time the damage of cars in your garage will increase.
It's recommended to sell your cars often, so they don't lose value over time.
Unlocking
You'll start your journey of stealing cars with low value and high damage, slowly but surely you'll be making progress to unlock more valuable cars.
Each newly unlocked car will have reduced damage upon stealing, and eventually unlocking a brand new type of car which holds more value.
Stats
Stealing cars also gives your character a little bit of stats.
These stats are very, very minimal (0.02% compared to a single crime) however stealing cars requires no stamina, so it's a nice little bonus to your characters overall stats.
Stats obtained from stealing cars is pretty much random, you cannot influence if stealing a car will give mostly offense or otherwise, it will be decided randomly, but fairly evenly divided among offense/defense/stealth.
Overall there is no downside to stealing cars in relation to your strength or character stats.
Income
Every car being sold will result into you earning some money based on the damage and value of the cars being sold.
You'll also be contributing towards family income (if applicable) and city taxes.
Sold cars will also help with income based on the earners competition, so you might want to time your car sales accordingly.
You can further improve your income by investing talent/skill points in relevant GTA related skills/talents.
Garage
Your garage contains all the cars you've stolen.
At the garage you can decide to sell specific cars, or sell all the cars there, or select which ones you want to sell.
You can sell the cars at any time you choose, you can choose to sell them right after stealing, or you can wait until you leveled up some income related skills/talents, or when you've joined a family to increase your family income or until the last moment of the earners competition.
Keep in mind that cars that are in your garage at 00:00 game-time will receive additional 'damage' which will decrease their selling value.