Business Law question?

Okay, real quick I have 2 questions and I'll explain each of them.

1) Contract Clause, my definition is that a Contract Clause is the clause in the U.S. Constitution that prohibits the government from unreasonably interfering with an existing contract. Okay, I understand this but can someone elaborate a little more, preferably in English (not law lingo) so I can get a better understanding?

2) I just want to make this clear- I am studying for a test, I am not asking for answers for my homework. And I was also wondering, if anyone knows of any websites that might be of some use. Just in case I need help with my other terms that could briefly explain any scenario’s or examples with easier definitions? I'm not trying to be lazy or dumb, I'm just dyslexic and get confused easily, especially with this stuff as I'm beginning to understand.

And no, the movie "My cousin Vinnie" does not help me very much, lol. Anything that could be of use for studying I would greatly appreciate, please and thank you~! :)

(Please try to be considerate with your answers)