The photo above is a finger joint with wood and others so I will explain the main ways how to do so.
you must get the right tools in order to makes this as a joint. and you must have a bench locker to hold the wood firmly
Step 1 - the tools you need is a ( saw,wood pecker, steel ruler, Tri square)
Step 2 - you have to mark out your wood so you know what to cut off.
Step 3 - make sure that your marking is even with the others and then you can start cutting the wood.
Step 4 - after cutting the wood you have to get your wood chipper and chip out the waste wood you finished cutting .
