## [9 things every React.js beginner should know](https://camjackson.net/post/9-things-every-reactjs-beginner-should-know) > I've been using React.js for about 6 months now. In the grand scheme of things that's not very long at all, but in the ever-churning world of JavaScript frameworks, that just about qualifies you as a bearded elder! I've helped out a few people lately with React starter tips, so I thought it would be a good idea to write some of them up here to share more broadly. These are all either things that I wish I'd known when I started out, or things that really helped me 'get' React. Some nice tips if you're starting with React.js. ## [Run Your Code Online](http://code.runnable.com/) > Run Your Dart C++ Java Rails Node.js PHP jQuery Ruby Django express Python CodeIgniter .NET Flask CakePHP Bash Code Online. This seems to be a nice test environment for different stacks. A good way to quickly test out some code.