I am a UI-UX Designer working for web and mobile apps since last 2 years. Now I am planning to expand my skills and want to learn basics of Animations (e.g Compositing a Mobile App into a Cell Phone) , GIF Animations etc.
https://www.behance.net/gallery/42033301/Paulig-Cafemoji
I know I need to learn Adobe After Effects but which path, books, tutorials should I start watching to get a good grip of this area?