Can someone please tell me or give me a link to a site that has illistrations of doing correct crunches/ sit-ups and correct push-ups?

What's the difference from a sit-up and a crunch?

What different ways can I do push-ups? (like arm placement)

How many sit-ups and home many push-ups should I do a DAY to get that ripped look? I'm not looking to get much bigger. I want to use what I have, but flatten it out and tone a bit. Thanks