Welcome to Flyertalk.

You know, not so many years back I was in the same boat, and really there's just so much to learn. The best way to go IMO is to start at the sticky posts at the top of the forums that interest you, and just dig in.

The sticky posts (posts that stay at the top of each forum) are generally well maintained and contain a huge wealth of information.

Over time the jargon will start to make more sense, you'll gain a lot of insight into the business and generally get better at discovering and optimizing your travel situations.

There's no "right" way to start, just let your curiosity lead you. Today you might think "I want a business class ticket on American Airlines from Los Angeles to London connecting in Chicago" and not long from now you'll be thinking "AA LAX-ORD-LHR in J/D/I" or some variation thereof, all the while calculating CPMs in your head based on your memorization of the route mileage, the fare basis, and your AAdvantage tier bonus.

It's an art as much as it is a science. Just remember to have fun while you're doing it. That's what it's all about for me, anyway.