Do you have a credit card?
This video goes in depth about:
0:15 - What's A Credit Card?
0:30 - Why you should have one
0:49 - The Cons
1:03 - How to Choose the right one / 3 different kinds
3:06 - What's a high end card and why you might want one
3:52 - Why Not to Have A Store Credit Card
4:29 - Getting Approved, What's a credit limit, and Secured vs Not Secured Card
5:20 - How much to use and what to use it on
6:20 - How to Pay

Skip points for mobile are in the comment section.