India pale ale — IPA for short — is the beer style where many drinkers began their path toward beer geekdom. Even the diviest of dive bars in Chicago is likely to offer Lagunitas IPA or Revolution Anti-Hero IPA these days.Yet for casual beer drinkers, IPAs can remain a bit of a mystery. And the proliferation of IPA spinoffs such as session IPAs and Belgian IPAs has only made things more confusing.But don’t feel bad if you don’t know much about IPAs.In fact, a lot of misinformation about the style …