Angular 4 general query

Question

Hello,

 

       I have some basic queries regarding angular4. 

 

     1)   I know angularjs 1.  Now I want to learn angularjs 4. So can I deirect moves to angularjs4 or I need to learns angular 2 first ?

 

     2) It must to learn typescript for angular4?

 

    3) Can someone suggest me some good tutorials for angular4.

 

   Thakns in advance.