If you’re a website or blog owner, you can sell a portion of your page space to advertisers and earn money passively each time the ads are clicked on by your target audience or visitors to your website. While the actual placing of the ads is completely free, the earning capacity of cost-per-click (CPC) advertising is based on the level of traffic to your site and the cost per click and click-through rate, or CTR. The most popular way to earn money today through advertising clicks is through Google AdSense or similar advertisers.
Serial Entrepreneur: Many entrepreneurs get the most joy out of starting and building a business, but not in its continued management, so they sell it to launch a new idea. They are still considered entrepreneurs because they operate and assume risk in the business for the time they own it. Other times, serial entrepreneurs juggle several businesses at once, earning multiple streams of income.
... Most prolific are studies based in the UK. These studies cover a range of research themes., including the effects of technology diffusion (Daniel et al., 2014;Ruiz and Walling, 2005); urban or rural con- text (Dwelly et al., 2005;Newbery and Bosworth, 2010;Reuschke and Mason, 2015); housing stock (Reuschke, 2016) and gender (Ekinsmyth, 2013;Thompson et al., 2009). Whatever the focus however, HBBs are largely treated as homogenous entities in empirical studies. ...
Mobile applications are more popular than ever, with people willing to pay good money for ways to manage their lives from their smartphones. If you have a great new idea for an app and know how to code, you can run with it and create your app yourself. You can also become an app developer for businesses that need to create specific apps. Both options will require you to know the basic elements of software design and at least two common programming languages, such as SQL, JavaScript, PHP, Python, Ruby on Rails or iOS.  
Many people buy and sell domain names to earn money online since it takes very little time or investment. You can purchase a domain at its registration price or even much cheaper and then resell it for a profit. But, it always pays to do your homework first on websites like Afternic.com, Sedo.co.uk, or other domain auction websites in order to get a good idea of what’s popular in terms of domain names. An ideal way to find really good names is to check out terminated lists that offer many expired names and have made their way back into the pool for people to buy. A good site for this is expireddomains.net where you can put in your desired keyword that you want in your domain name and a long list of domain options will appear.

The internet changes so fast that one year online equals about five years in the real world. But the principles of how to start and grow a successful online business haven't changed at all. If you're just starting a small business online, stick to this sequence. If you've been online awhile, do a quick review and see if there's a step you're neglecting, or never got around to doing in the first place. You can't go wrong with the basics.