There is a lot of questions coming from people, who have became familiar with GTA: Online only recently, about the ways of earning money in the game. As the Heists update has come up there is an another way to receive the bunch of money in game. Let's keep to the point: the most widespread and well-known way of earning money is completing missions.
When playing missions (and not only them), pay attention to the bodies of those those fell, sometimes they have some spare money in their pockets - grab it now with your dirty hands. When free roaming through Los Santos, keep your eyes opened for bounties on players (you can do it as soon as you reach level 10). Remember that you can sell stolen cars (except for luxury super expensive ones, which can not be obtained, nor sold illegally). There is an interesting mechanic in GTA: Online, designed to force players interact in different activities, named "Daily Objectives".
The first thing you have to do is get a cop car and bring it to one of your houses that has a garage or it won't work. In case of singleplayer (aka GTA 4) everything is rather obvious, however in multiplayer, GTA: Online, completely different game laws are applied - no wonder newbies are often confused.

This is task by sir Lester, you have to do it for approximately 4 minutes, and, depends on your success, you can learn money with a sum of somewhere around $1000, however try to use as little ammo as possible.
Bear in mind, that you can sell only one car once per 45 minutes (real minutes, you don't have to spend them in-game, however). Once a day you will be given three simple tasks, the point of which varies a lot - it can be a play in golf, a walk in the park (literally) or some really serious business. So, there is a numerous ways of gaining money in GTA: Online, and we are goind to discuss most of them. It may turn out like this: after a hours of tense action you receive only 5% of all the money, which absolutely no worth for all your time and energy that you spend on that.
Martin and Lester tend to pay the most and we highly recommend taking their missions only for money-earning purposes. However, it is not recommended to take on low-payment contracts, as you are risking to lose more than you earn. For example, the Series A Funding heist will bring to the crew about 400 000$ in the Normal difficulty. If you are lucky enough, you can earn up to $25000, and if you are, huh, unlucky, you can lose up to $500 (not taking in account possible spendings on ammo).

And also the heists aren’t easy tasks, so if you try to complete it with random people it may go with stress, depression and losing the faith in mankind.
Also, it is much more easy to player with your freinds and pals, furthermore - not only it is easier, but also more profitable, as there is a bonus of +10% profit per each crew member. For example, in mission "The Los Santos Connection" by Martin, near enemy hordes there are boxes, which can be shot opened, and you get two packages of coke out of each, each of them costs $500.
Go back to the cop car, get back into it and out again, repeating this over and over to get more money. Not that bad, but you have to complete the mission first, which not as easy as you may thought. Otherwise, if you already have a good team the heists may become really useful and lucrative.
It is also a nice idea to select "Hard" difficulty when starting up a mission, as different difficulties provide different profit modifiers: easy provides none, normal is 25%, and hard is 50%.

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