Hi Ziggy, and welcome to ATP.
Acorns are our currency here. There's no money involved in anything we do. e.g. there are occasionally raffles here at ATP, and we buy raffle chances with acorns. In the first "sticky" thread of this welcome forum, Trish gives a nice little description of acorns and how to earn them.
The thread "Help with site features" in
Welcome forum
Karen