YarnCon. The class covers several techniques for avoiding knots, such as spit-splicing and the Russian join, as well as tips on knots for when they are the better option.
As an easy reference for my students, I am listing links below to tutorials for the techniques we'll be discussing. I plan to keep these updated, so please let me know if you have an issue either with the link, or with the quality of the tutorial.
Invisible Braided Join (one color)
Invisible Braided Join (changing colors)
Weaving in Ends As You Go