(note: I am fully aware that the majority of blog entries on this topic share the same article title)
There is so much to learn about REAPER! The scrappy DAW alternative that has been slowly building is reputation over the last 10 years is so incredibly modular, customizable and flexible that to go into it without having a goal in mind of how you want it to work for you is almost counter-productive. It's best to bend it to your will, to mould it in the image of the DAW you want it to be, the DAW you'd like to use.
There are plenty of useful (and some not terribly useful) resources but I can't see anything more valuable or educational that Jon Tidey's The Reaper Blog with articles, tutorials and inks to workshops and personalized training - it's the gateway to a community of power users that revel in sharing their expertise. It's worth any price, and secondary to buying yourself a proper REAPER license (which is kinda sorta not totally necessary but HOT DAMN should you ever do it - SUPPORT) it is wholly deserving of a contribution to the tip jar. Jon was good enough to visit a meetup I attended at the Centre For Digital Media a few weeks ago and do an intro talk to REAPER. He's an excellent sales pitch and makes it all seem very accessible.
And who doesn't like a good acronym?
REAPER: a Rapid Environment for Audio Production, Engineering, and Recording.