I came across a very excellent primer at In the Woodshop on how to make a hand-cut mortise and tenon joint. Even if you have no intention of making mortise and tenon joints, the tutorial offers many tips and tricks that can be applied to other areas of woodworking.
The write-up is choc-full of clear images, thorough explanations, and useful information, and it moves along quickly and smoothly.
Hand-Cut Mortise and Tenon Primer by In The Woodshop
Photo by Derek/In the Workshop, used with permission.
And if you have a little more free time, check out some of Derek’s reviews, projects, and other furniture how-tos.