Advertiser Disclosure:  some links to credit cards and other products on this website will earn an affiliate commission. Recently, two couples interested in traveling more asked me how they could use credit cards to maximize their miles and points earnings.  As I discuss in my Step 1: Strategy page, credit card spend is only one portion of a larger travel strategy.  You should not apply for a new credit card if you cannot pay it off in full every month (the monthly fees will negate any extra value that you would receive in points) or your credit score cannot withstand a…