Hello all

Been doing the BTC thing for a while but I am starting to get into the Alt Coin thing now and keep seeing PoS and PoW ... I know PoS = Proof of Stake and PoW = Proof of Work ... but what does that really mean

seems some coins are mine for 7 days on PoS and then switch to PoW? Also how does one get the interest from coins ... do I need to keep them in a wallet or something like that and not transfer them .... just seems very confusing to me is all so was wondering if some one could either "dumb it down" for me or give me a very basic website addy that explains it all out
Thanks in advance
Blorgg