I'm new to all of this too. Last year I had two credit cards and they were only for emergencies. This year I have 10. Managing them gets complicated.
I got the
walla.by app on my phone. It helps me determine which card to use where/when. It also keeps track of upcoming bills (I have them all set to auto pay so that's no big deal but it helps see where I'm spending). It also has other features but I don't really use those (at least not yet).
I have Mint also but I find it frustrating because it has trouble syncing with many of my accounts. It's still a great tool to see your overall financial picture (because you can include your mortgae, cars, student loans, retirement accounts, assets, etc), but Mint won't tell you which credit card to use where in order to maximize rewards.
I think I need to add Award Wallet to my system too.
