Does investing money online can really help you earn more? But how?

If it's on the internet its probably a scam

Not these scam "job" sites that charge you to sign up.

I do not think this is a good time to invest in the stock or commodities market. The market is greatly overvalued due to the low Fed interest rate. The time to buy was during the bottom of the crash of late 2008 that occurred in early 2009. I think it helps to be a good poker player to beat the stock market. I used eTrade (on line) to make a pile of money during the crash and never read a book about investing and only have a high school diploma with a 2.9 GPA. I invented my own system and later found out it is called market trending.