You can say thanks for any reason by clicking "Thanks" in the bottom right hand corner of anyones post.
Rep im not totally sure but I know ive for it for noticing and reporting trolls. Not totally sure on that one.
Hiya ... read this and understand it now ... but it says:
How do I know what reputation I have received?
You can view the reputation that you have received in your User CP (User Control Panel) where it is displayed at the bottom of the User CP page. Here you will see the latest reputation that you have received and whether this is positive, negative or neutral.
But there isn`t anything about it in my user CP ? There is just my subscribed threads and nothing below it ? ?