You can invest on stocks online now. Stocks are shares of ownership in a corporation. Usually the big companies in the country are listed in the stock market so that you can buy their shares at a low price, then hopefully sell them at the high price in the future so that you can have a profit. You can either buy or sell stocks via a licensed stockbroker, who in turn gets a certain commission from every transaction you make usually about 15% commission.
The challenging part about investing in stocks is making the critical decisions of WHAT to buy and WHEN to buy it and WHEN to sell it. You will have to do some research on the company's performance over the years and whether there are upcoming changes to be expected soon or not.
Try attending a seminar on stock investment or do a research on the internet on stock investment from any accredited stockbrokers. They usually give it for free. There are risks involved especially if you don't track your investment properly, so make sure you have the patience and determination before going for it.