Online videos, forum and using it! Though probably not in that order. User groups can also be helpful if there is something in your area. There are even a couple of books now.
There are plenty of single comments that are very educational such as:
Order of filter evaluation by Joe Mako: Re: Question on how to create a product velocity calculation
I wish someone collected similar pearls as a resource titled precious forum comments for self-learners.
It could also be a collective effort. It would be nice if others join this thread about resources for self-learning and share links to other forgotten educational comments that help beginners, intermediate and advanced users to improve their Tableau skills.
A collection of great resources outside the community would also be valuable. This is probably already done repeatedly. I think it is more a question about making a resource page that makes it easier to find previously shared collections of resources for self-learners.
It's not complete or up to date by any means, but see: http://drawingwithnumbers.artisart.org/wiki/tableau
It's the comments, blog posts, KB articles, etc. that I've found most useful, printed out it would be over 60 pages.
You could go old school down the road
- Tableau 8: The Official Guide: George Peck: 9780071816786: Amazon.com: Books
- Tableau Your Data!: Fast and Easy Visual Analysis with Tableau Software: Dan Murray: 9781118612040: Amazon.com: Books
plus youtube videos, tableau public examples and zen masters blogs.
Here's what I did to learn Tableau Desktop
1. Watch all the videos in the OnDemand training section of the website (including, when available, downloading and working with the worksheet for each lesson) .. watch all unto and including "Advanced Chart Types" in this list
2. Read Dan Murray's "Tableau Your Data" (I absolutely recommend this book - you need to buy this book. Mine is completely marked-up, highlighted, with post-its etc)
3. Download one or two worksheets from the Tableau public library and recreate - you'll love the exercise - it'll be fun, sometimes challenging, but an incredible exercise. You'll be surprised.