I don’t have any “one” setting for most material. There are a lot of variables in cutting and engraving; for wood there is species, grain, desired effect, thickness of material, ply or solid, surface smoothness, whether or not I masked… some of these factors change within the piece.
I always do a few test pieces, but this post that @evermorian shared with you is the procedure I followed to arrive at my starting point.
This setting was for seasoned cedar (from pallets) with a smooth sanded surface. The focus was purposely set wrong to reduce laser lines and soften the edges.