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.  

When one of your customers makes a purchase, you purchase the product from a third-party company (the drop shipper, usually a manufacturer or wholesaler) for a lower price. This process is as simple as forwarding the order from your customer, a process that can actually be completely automated. (Remember you don't have any risk here of buying inventory because the sale has already been made).
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.
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