If you're one of those people following Windows Phone very closely, including giving feedback to developers and Microsoft about the platform, I urge you watch as many BUILD 2014 seminars as possible. There's a mountain of knowledge that'll help you understand the WP platform in a very technical sense, e.g. RAM allocation, Universal Apps, etc.
If not, then I recommend you at least check out this seminar about the "New Windows Phone Application Model."
The New Windows Phone Application Model | Build 2014 | Channel 9
If not, then I recommend you at least check out this seminar about the "New Windows Phone Application Model."
The New Windows Phone Application Model | Build 2014 | Channel 9