Measure four table legs out of 4-by-4 pieces of wood to the desired height of your table legs. Mark the wood on all sides with a straight line, using a ruler and a pencil.
Cut each leg neatly and squarely with a table saw, being careful to follow your pencil lines and cutting squarely across. These legs will provide a sturdy and appealing base for your table.
Cut 2-by-4 table rails to desired lengths -- two shorter ones for the ends of the table, and two longer ones for the length. These will form the base upon which the tabletop will rest.
Cut tenons, or mortised areas, into the corners of the top ends of the table legs that into the tops of the table legs, using a handsaw. Make sure these tenons match precisely the width and thickness of the table rails. Nestle the rails into the tenons to make sure the pieces fit seamlessly together. Secure the tenons to the rails from the inside using wood screws.
Cut double slots and ridges in the edges of the 2-by-6 table planks, using a plate joiner. Run a line of glue along each slot and fit the planks together, clamping them together until the glue is dry.
Drill starter holes 1 inch from the end of each cleat, and screw wood screws into the cleats to attach them along the inside of the table rails at each end of the table. After each cleat is attached, lift the newly-formed tabletop onto the frame. Secure it to the cleats underneath the table with wood screws,
Finish the table using a stain, varnish or other wood protector. Place it in a central location on your patio, and enjoy it for many years to come.