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It depends on what is your areas of interest. Well there are few which i know. it includes
Steemit
Crypto trading
Forex trading
Online commodity trading
Stock trading
Selling things on different sites
There may be many others depending on the investment amount.

Online earning is becoming more popular day by day and some of the things that are popular way

of making money online is
blogging,cryptocurrency trading,taking
surveys,getting paid to complete tasks,binary

trading,forex trading,gettting paid to write
articles,making money as a freelancer and so many others,but i believe that cryptocurrency

trading is still the best way of making cool money online and websites like musing.io and

steemit.com are cool places where you can develop your knowledge and skills and still make money from it too...

Forex trading is a good way to earn money
You can use fxpro.com as a your forex broker and start making money from forex trading

You can also start doing binary option trading
You can use binary.com to start doing binary
Option trading and earn some cash,the binary.com allows you to open a demo account that you can use to learn binary option trading

You can also invest on cryptocurrencies like
Steem,steemdollars...you can visit steemit.com and open an account which can make you
To easily have access to investing on steem

IT is totally based on how much time you can give to online field if you do as a job 9-9 you can get a huge amount of money you never expected i have some list of sites if you give time the income is yours:-
1)Steemit
2)Presearch
3)Cortex
4)Trading at binance
5)MlM company

I recommend STEEMIT. It is the best platform so far I've discovered.