What will be the fastest way to make money on GTA online without investment and living at home?

In Grand Theft Auto Online, there are several ways to make money without investing real money, but keep in mind that making substantial amounts of in-game currency often requires time and effort. Here are some methods to make money in GTA Online without spending real money:

1. **Contact Missions:** Participate in contact missions by calling various NPCs in the game. Completing these missions can earn you cash and reputation points.

2. **Heists:** Join or organize heist missions with other players. Heists can be a good source of income, especially if you successfully complete the challenges associated with them.

3. **VIP Work and CEO Jobs:** If you own an office, you can register as a CEO and participate in VIP Work and CEO Jobs. These activities can be done solo or with a group, and they offer decent payouts.

4. **Motorcycle Club Businesses:** If you own a clubhouse, you can start various businesses such as drug production, document forgery, and more. These businesses generate passive income over time.

5. **Time Trials and Races:** Participate in time trials and races to earn cash and reputation points. Some races and time trials can be completed solo.

6. **Daily Objectives:** Check the daily objectives list and complete them to earn additional cash and RP. Completing daily objectives for a consecutive number of days will provide bonus rewards.

7. **Special Cargo and Vehicle Cargo:** If you own an office and vehicle warehouse, you can engage in special cargo and vehicle cargo missions. Importing and exporting high-end vehicles can be profitable.

8. **Arenas and Challenges:** Participate in activities at the Arena and complete challenges to earn Arena Points, which can be converted into cash.

Remember that while these methods can help you make money in GTA Online, the game's economy may change over time due to updates and patches. Additionally, the in-game economy is designed to encourage a balance of activities, so diversifying your income sources might be more effective than relying on a single method.