I'm not sure how long these will be offered, but Craftsy has three knitting classes you can take for free.
In's and Out's of Grafting with Anne Hanson - how to invisibly join knitting stitches.
Know Your Wool with Deborah Robson - look at different fibers and the best use for each type of wool.
Short Rows with Carol Feller - how to use short row shaping for a better fit.
And if you're not a knitter, there are other free classes listed here. I'm going to have to schedule some class time!
Happy Creating! Deborah