creatinefacts.net

So I have seven credit cards and am paying them off one by one. I just paid one off today and shreded the card up. Should I also leave the card account open? There is no APR or anything. Someone told me never to close a cc account because if someone is willing to lend you money it shows and is better for your credit. Someone else told me that if you have a bunch of open cards with 0 balance, that will lower your score becuase it means you have potential to max out your cards and owe lots of money. So it looks bad if you want a house or car loan. What should i do?