If you are trying to earn money online & need only small extra income less than $200 then PTC sites are the best way to start.
Here you need to click & read the advertisements for 10 to 3o seconds & get paid for each & every advertisement you view.
There are many sites where you can register & make money by reading ads. All sites are free & there is no investment at all.
You can check this list of best PTC sites, signup & start earning.
1.clicksense
2.neubox