My advice would be to focus on learning what is required for you want to achieve and ignore the rest for now. If you have a specific goal you’ll both learn quicker and get more satisfaction out of it. So rather than think about in the terms of “I have to learn Ember.js”, think about it in the terms of “I have to learn whatever it takes to build what I want to build”.
For example, you could start by adapting my QnA plugin for your purposes. Would be happy to give you committing privileges and some tips along the way.