The very basic way of making money online is by creating a website or blog and take advantage of the traffic by having advertising networks serve ads to the site. Publishing contents relevant to users' needs will attract more visitors to your site. Once your site becomes popular, you can then insert ads to every pages of your site to earn revenue. You can join popular advertising networks like Google Adsense, Bidvertiser, Admob (for mobiles), Buzzcity (for mobiles), and AdBrite. Once visitors click on the ads served by these networks, you get paid.

Sell someone else's products as affiliates and earn commissions for every lead or sale. Many companies are now selling products online through partners and affiliates. And so many have earned regular income by selling products as affiliates. You can check this sites offering products to affiliates : Commission Junction, Clickbank, LinkShare, and ShareaSale.

Another way of monetizing your website or blog is by selling space for advertisements. You can earn extra income by allowing paid advertisements on your site.