It's really not as complicated as it sounds. MessyEater does a good job of breaking down all the available options, but in the end, if you were comfortable using the old magstripe fare cards or a Chicago Card, Ventra provides options that are nearly identical for the lay user.

The only real quirks come if you want to use your own credit card in place of purchasing a Ventra card, or in using a foreign credit card. If you just want to walk up and buy a ticket using cash, it's still very easy.