Its like mining bitcoins only staking is minting them. Staking is earned interest by running desktop wallet and supporting the network. Potcoin is the easiest one cause you can buy potcoin using android app Coinomi.
Pivx is a little better but you have to go through bittrex to get thr coins. If you have 10,000 pivx coins you get to vote on what the network does.
RE: Good cryptocurrency investments at 18/8/2017.