And the router is the tool to use to cut these joints. You'll also need a router table to safely make the cuts. Rail-and-stile bits are sold in sets, and raised-panel bits are sold individually.

This is made for a bearing bit and is easy to use. You just need to find the center of your piece and the arrow at the end of the template matches up to it to perfectly center the hole 9 inches ...

Routers are amazing tools, but they are not forgiving. Make a design template and use that to create accurate and identical pieces, each time. Use a 1/4” piece of hardboard as your template.