Hello Guiseppe and welcome! (Also this is my first post too)
There are quite a bit of guides that one can follow, so I can understand your need to look for the best route, so I will share how I got started.
These guides were a starting point from getting it installed and working with the fundamentals and basics.
When then beginning go deeper into EmberJS, I found myself browsing through all the different videos for EmberScreencasts and eventually even paid the $10/month to get access to the more premium and specific videos available which definitely taught me a bit and also helped confirmed some other things I inadvertently learnt while working with Ember.
TodoMVC - YouTube
Build an Ember App Part 1 - YouTube
Prototyping an Ember.js App in 20 Minutes
The above Youtube videos were some of the videos that helped me understand Ember.js as a whole and how things were connected and how it all worked. And gave me an overall idea of the productivity that I’d be picking up on as I would move along with Ember.js.
If you have some money to spend and time set aside, Ember School looks really promising as well. Its made I believe by the same person who did the EmberScreencasts website and I believe for what you’d be paying and for what they are promising in return is of great value - I am sorry however I haven’t gone that route personally so I cannot say anything about the actual course itself.
Biggest thing I learned about learning Ember.js - Find a problem to solve. This goes for any kind of development language really, but knowing what you want your end game to be helps you learn to use your language/framework/tool of choice more efficiently and will allow you to retain what you’ve learned.
I realize you asked for ‘a’ path to learning Ember, but having options isn’t a bad thing too, right? =)