If you want to do investment online, you can use online platforms suggested in your country. Here you can invest on partial as well as full shares of stocks of companies. As the rate of these stocks increase, there will be increase in your income. Thus you can earn some extra income. But you should be careful not to invest more than the level of savings you can handle for a loss. This way you can earn something and also get some time for learning. Here is an example i would like to share with you.
In this example i have shared an investment of $50 in stock of a company. The company is doing good and i have earned $5 within a period of some weeks. Thus my capital now totals $55.01. If i had more investment like a $1000, i would have earned 20 times of that investment and my income would have been $100. This is how this platform works.