Guys, where can I find how many reward points I am gaining for comments, posting or topics raised on forum etc.

You get the following as far as I know and I also get them like that.

100 reward points is 1 USD

25 reward points for each course or blog comment or forum posting.

You can check your reward points in your dashboard panel, the below is mine.

You can also check the detail on how many reward points you will get on which activity, Please refer the link below

Reward Points System

There are 250 reward points for publishing a blog article and 400 reward points for publishing a course of you are an instructor @uninets 

100 reward points = $ 1