Well, have no fear. While GIMP 2.8 brings with it some really important updates and advances, it’s not a completely different animal from GIMP 2.6. You should still be able to follow most GIMP 2.6 tutorials without too much trouble, though there will be some changes to GIMP 2.8 that might throw you for a loop.
To keep you up to date, I made a video that covers some of the highlights of GIMP 2.8. It includes the changes to GIMP brushes and brush options, the new GIMP 2.8 text tool (it’s awesome!) and GIMP’s new layer groups.
These aren’t all of the changes to GIMP 2.8, but they’re changes that I think a GIMP beginner can really appreciate.
As always, if you have any questions you can leave a comment and I’ll do my best to answer. Enjoy!