This guide is suitable for both experienced and novice players, but it is advisable to get access to such things as an orbital cannon, mk2 oppressor, heavy sniper rifle, RPG, sticky bombs, Lazer, Hydra, Speedo custom.
This guide will cover the best ways to make GTA money fast, and the biggest plus is that the methods can be combined. So let's get started!

The best way to make money is, of course, to buy a Sharkcard, tap on "Home" button, select the "Shop" section and buy the amount of money you like. But it would be better, if you give me all money you wanna spend on this to me, I'll spend them clever, unlike you.
The advantages of this method are instant receiving of in-game currency, acceleration of the release of the sixth part.
Objectively no cons, if you are not a broke poorfаg loser.
I recommend this method if you used obviously ineffective and incorrect methods like: Vehicle warehouse, special cargo, motorcycle club, etc. And even more so if you are victim of so-called griefing.

So, for some reason, you could not afford to purchase the Shark card, but that's okay, there are many ways to make money in the game without microtransactions.
The best way for a beginner to earn starting money is by killing players and picking up money. For each kill, you can get around 100-500$, the most important thing is to pick up money from corpses. I do not recommend killing NPCs for this purpose, as they are not worth the ammo spent on killing them. If you know how to enable godmode Skillmode, you can definitely do it, to increase farming efficiency. Don't pay attention to angry comments from your opponents, they are envy of your amazing gaming skills, you may respond with "1-0 Lzzzzzzzzz" (I suggest using that phrase if you have better score than your opponent, for me this is always the case, because I'm so good at the game, that I cannot be killed.) or just "Cry noob" I also recommend attacking players that obviously weaker than you (Low level or people that can't fight back), by doing so you help them get good at the game and encourage fun for everyone competition.
Pros: Develops game skills, increases the Kill/death ratio (The most importaint indicator in the game, it's the only objective way to measure player's skill), cool, profitable.
Cons:For many it is tiresome to pick up money. If you are not lazy, then no.

This step is one of the most important, as it is the best and correct way to farm money.

If you see notification like this, then go and destroy that cargo, without any hesitation, in addition to a ceo crates there is: a bunker, a motorcycle club, a vehicle warehouse, an aircraft hangar and a nightclub. It all comes down to the destruction of property marked with a red icon on the map, try to destroy as much cargo as possible, you need to do this at any cost, if you are struggle with that or don't have time, you can always use the orbital cannon, it's worth it. Usually, for the destroyed cargo, they give $ 2000 or other pleasant bonuses, if you have not received them, be sure to contact Rockstar technical support, you will be compensated for the damage received due to the bug.

Pros:
Cons:None
TIP:If you having problem with finding cargo to destroy, make sure to pay a visit to a "Grinders in Black" crew, they are currently on 210th place in crew leaderboard, you may find some of them moving their garbage pretty often.

I strongly recommend watching X-Lzzz-X's videos, he is #1 Tryhard without a doubt
Here is the link to his channel: https://www.youtube.com/channel/UC1v9g-llTxab1gsaMyhyANg
Objectively the best gta player of all time, his videos will help you to improve your gaming skills.
If you subscribed to channels such as:TheProfessional, GhillieMaster, Motmus and etc...
I suggest you to unsubscribe from them now. They are making trash content not worth your time, you may lose all of your skill and become bad at the game because of their awful videos.

Your cellphone may be come in handy to make some money, for example Lamar offers really useful service "Call Mugger" (Steals from other player up to 10000$), I suggest using it on any low level players, because they are more likely to keep their savings in cash, and don't put it in the bank, also there is much higher chance of successful robbery.

It's also worth mentioning bounties from Lester, if you have rich friends to help you with money, ask them to put bounties on your victims, in addition to money pickups you will recieve some extra cash from bounties. And yeah, when your target recieves bounty it loses "Ghosted" status to everyone and can't go in passive mode.
I also want to mention opportunity to earn extra cash for the most skilled players, you may try go and grief trash grinders, they will put a bounty on you, this is exactly what we want! It gives us several benefits with no apparent downsides. It's a great bait to lure our victims in fight, that means even more players to kill and pick up money from.

If you manage to survive one in-game day, you will recieve money that was put as bounty on your head. This is really good way to get extra 1000-9000$!!!

Key to successfully accumulate profits, is a good management of money and resources at your disposal, this rule also applies to world of GTA online.
First thing you should buy is an oppressor MK 2 and Terrorbyte (This one required to put rockets upgrade on your oppressor)
This versatile vehicle requires immense amounts of skills to master, entry threshold is insanely high, only the best players can use it properly.
Orbital cannon is the next mustbuy thing to obtain, it also great way to earn money, really good at claiming bounties and destroying cargo. But also requiers tremendous skills to use, I for example mastered shooting it with no reload technique.
Someone may say that this method nets us negative profits, but! I am genius businessman will share with all of you my strategy for free. Listen closely, we go to the stock market and invest in TakeTwo interactive (Parent company of rockstar games), after that we start our griefing spree and enjoy the profits from our actions! We use that accumulated profit to buy even more sharkcards.
I started playing in 2017, that's why TTWO stocks went UP, it's all because of me and other griefers.

There is plenty of inefficient moneymaking methods in GTA online, I suggest avoid them.
That includes:
Vip Work
Mc club businesses
Ceo crates
Vehicle warehouse
Bunker
Hangar
Nightclub
Heists
I don't recommend using such methods because you may end up being bodied by griefers and recieve nasty messages, something like "1-0 Lzzzzzzzzzzzzz" or "Cry noob"
You are more likely end up like this:But if you still want use such methods, there is list of cons and pros for you...
Pros:None
Cons:Dull and repetitive farming, long missions, there is high risk to lose all your savings because of griefers, selling drugs and weapons is deplorable and immoral, you will lose so much skill in game, because you will get used to simple boring tasks. You are also most likely to be fired from your real life job, because instead of doing something useful, you decided to waste all of your time on grinding in gta online.

If you use wrong grinding strategies, you will end up like him, a loser with nasaly voice without personal life. Do you really want end up like this? No? Then go grief people and farm money in a right way.

Never used that method myself, but I heard about really good way of making Free kills for K/D money in gta online. Sometimes you may see that 999999999999999999$ invites, you are most likely don't click on them because this is too good to be true, but what if I tell you that it's actully works! Yes! If you see such an invite make sure to join the mission and wait untill the end, don't quit it or you will don't get any money. As far as I know, when host kills you, you will get 1 million dollars for each death, this is a good deal, right?
This is demonstration of how it works: Not sure how much money he got here, but he already have KD above 30k, I think this is worth to mention.

Uhh... umm... conclusion??? Oh yeah... right, so make sure to grief as much as possible and buy sharkcards, you will always have enough money and Rockstar's grace.
If you follow my guide, you will become one of the best players of gta, like this cool man in cool rebreather mask on that picture... yeah.