The traditional way to add legs to a table is first to connect the tops of legs to a series of rails, creating a separate base. The top then attaches to that. That type of base demands high-skill joints like mortises and tenons to connect everything. Lucky for us, there are much easier answers these days.
A variety of companies now sell self-supporting legs that simply screw onto any top you have, be it a wood slab, butcher block, old door, old workbench top or whatever. In my book for beginners, “Build Stuff with Wood,” due out next fall, I show four of these leg systems. Here they are, attached to a variety of tops.
You can imagine the rest of the possibilities, I’m sure. By the way, to find out how I surfaced and finished the beautiful walnut slab that I used for two of these tables, go here.