I ask because the master woodworker I took my one class from had a library of custom jigs. He was also amazing to watch, even when planing a board. Confident and skilled. His passion was making shaker-style chairs. Chairs are hard to make because they have to be constructed properly (so many external stresses from people sitting in it, rocking back etc.)
I loved his philosophy of there is no right way to do something (in the woodshop) - only smarter, faster, and safer. And how he revealed the secret of shims to make a joint snug.
I could go on and on. Suffice it to say, you can learn a lot by taking a furniture making class, taught by a master.