Doubts in gstr3b

Hi guys, I have some doubts regarding the filling of gstr3b.

1. In 3.1 of GSTR3B should we need to enter the purchase details from registered dealer? 

2. Regarding Eligible ITC, where we need to enter the purchase details  from registered dealer, either in Inward supplies ( Liable to Reverse Charge) or in Other ITC.

3. Similarly should we need to enter the supply details in ITC reversed.

At last I got remaining ITC of 3000 from July's filing where to enter this sum in August GSTR 3B? Thanks in advance.