I need a loan from the bank. But, of course, I have no credit. What exactly is credit and how do I build it up?

I'm not really sure what credit is, but I know a way to establish some, but it takes A lot of discipline. Apply for a credit card with a low limit, something you think will suit your needs. Then, use it for things you know you can pay for with a debit card or cash (gas, groceries, etc.). Then when you do this, be sure not to spen any of your money because you'll need it for paying the credit card bill.