Downloading the tools
Let's get started by installing a complete Dart development environment on your computer. The home of Dart on the Internet is https://www.dartlang.org, which contains the software, a wealth of documentation, and links to the online Dart community.
I would strongly recommend signing up for the e-mail lists on this site to keep up with Dart, and also the Dartisans Google+ community (http://g.co/dartisans). The number of daily messages can be overwhelming at first, but there are some great discussions and information sharing. It is also a great opportunity to interact with Dart's creators.
It is recommended that you use the Stable channel. This version updates roughly every few months via a built-in update tool. There is also ...