As a freelancer or developer, dealing with the business parts of your work will have a huge effect on your success. Having brilliant coding skills will kick you off, however, you'll have to maintain the business adequately to make money in the longer run. Invoicing is one of the significant pieces of maintaining a freelance business. It shouldn't be muddled (actually, it ought to be as simple as could be expected under the circumstances), however, it's a basic piece of getting paid for the work that you've done. According to o…