School me on credit

So... I've prided myself in being financially responsible with 0$ credit card debt between my wife and I because... Well we only have 2 cards between us. One from a credit union I've had since high school with a low ceiling, and a generic Chase card. After my first year out maximizing savings, I think we need to generate some credit beyond that we have. Both of us Thur far have done a decent job with scores >700. In hunting for a card, I'm genuinely confused. There are SO many options.... School me on credit
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums