Question: what are the four types of wood joints?
Answer: Butt Joint. The Butt Joint is an easy woodworking joint. ... 
Biscuit Joint. A biscuit joint is nothing more than a reinforced Butt joint. ... 
Bridle Joint. ... 
Dado (joinery) ... 
Dovetail Wood Joint. ... 
Finger Joint. ... 
Lap Wood Joint. ... 
Mortise and Tenon Woodworking Joints.