EmberJS Behind the scenes. Application route trigger and addons

I'm new to EmberJS. I google a lot but I'm finding it a bit hard to learn the in-depths of EmberJS.

I have 3 questions:

• How does the application route gets triggered?
• How are addons loaded?
• How does everything get loaded. I have a pod structure. But pod structure aside, how does ember know what is what by path? routes(app/pods//route.js or app/routes/.js), templates, templates, models, adapters (etc)

Basically, I'm ready to read the whole codebase of ember just to understand how everything works ;)

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PS: this seems to be a duplicate for the first question