Check out a free preview of the full Meteor course:
The "Adding Packages" Lesson is part of the full, Meteor course featured in this preview video. Here's what you'd learn in this lesson:
Meteor packages are similar to Ruby Gems or NPM modules. Packages can be installed directly from the command-line. Chris demonstrates how to add the MomentJS package for handing Date formats. He also walks through the atmospherejs.com website which makes it easy to find Meteor packages.