You have several legit ways, methods and sites which you can make money online without any investment. For example, through affiliate marketing, creating a blog that you can monetize, or self-publishing books on Amazon Kindle, but keep in mind that with these methods it will take you some time to reach those amounts.
Among the fastest and easiest ways are probably the paid online survey sites, where any person can earn money quickly and easily by answering surveys. A good tip for these sites in order to generate more income is to be registered in several apps/websites at the same time to always have surveys available. You can withdraw your earnings really fast from a low amount.
Other good way to earn money quickly and easily is through the PTC or GPT sites, where you get paid to perform various online tasks, such as watching videos, visiting pages, also completing surveys, doing micro-jobs, testing apps or even play games. In all these sites, the minimum amount to withdraw the money earned is usually also low, so you can get money quickly without the need for experience or any special skills. On these websites, however, you will have to sign up in several sites and be constant to earn money every month.
The best way to earn money or even get a salary every month is probably through platforms for freelancers and online jobs. ere you will need to create a good profile, provide clients with certain knowledge and skills and dedicate time to them, but in return you can get very good income every month. You can find all kind of clients and companies looking for people with specific skills and knowledge, such as programmers, designers, translators, community managers, SEO specialists, copywriters, influencers, content creators, etc...
You can also use many other alternative ways to generate income, even get passive income every month easily. The truth is that there is no special trick to earn 500 dollars online in 3 months, all you have to do is try various methods/websites and use the ones that work best for you. If you combine their use well and with some patience you can earn that amount and much more without problem.
The big deal is that many of the methods do not require any investment of money, but you will need to dedicate time to them if you want to make money. The more time you dedicate on these sites, the more money you can earn. In this wiki you can find also a lot of information and a good list about some of the best sites and methods you can use: