I have met hundreds of developers. The best ones always have a side project or two that they hack away on at night. As an employer I encourage that, but I have heard that a lot of workplaces ban personal projects. So let's talk about why I think that side projects is a good thing, how I use them to get better and what you have to look out for.

http://david.elbe.me/development/2014/09/26/side-projects.html