The community
My first year in Coda was spent diving into the archives of this community. It is an amazing wealth of resources, knowledge, experiments, etc
Start looking for posts with lots of views/replies and you’ll find some gold mines
Coda Doctorate
A free program offered by Coda to help you dive deep into Coda! @maria would have more info if you are interested
YouTube
Always a winner. Good old YouTube - I may be biased but I have my own solely Coda focused channel 
Building!
There really is no better way to learn that starting to just build solutions to real problems in your life. Dream of the moon and try to accomplish it in Coda. And post here when you’re stuck. You’ll grow really fast
Courses
Courses built by Coda pros are on their way soon! I’m launching my own soon and @Paul_Danyliuk is working on one that looks truly epic as well
But above all - I’ve easily learned and gained the most from posting in and reading in this community along with just starting to tackle problems that felt like they couldn’t be done. Then persevering until they were.
Cheers and good luck!