One common joinery method used in wood working is the mortise and tenon. A mortise is basically a hole in a piece of wood and the tenon is another piece of wood cut to tightly fit in that hole.

If you’re starting out in woodworking, you don’t need to know how to make the most elegant joints unless that ... with 90 ...

Any time you butt two pieces of wood together at 90 or 180 degrees ... to support weight or withstand stress. Some common ...

While the hammer joint seems mainly aimed at birch plywood, [Jiskar] mentions testing it in other materials, such as bamboo, MDF, and even acrylic, although wood seems to be the best application.