Ambient occlusion from high to low poly this is the first question that I post here, I want to know how the ambient occlusion bake works due to the work I did on these 2 models (high poly is still wip) 

and this is the AO bake I managed to make


I'm a complete noob when it comes to creating textures through bake, how can I avoid all that problems and artifacts in bake? for example the grid in the center has completely black results whereas the middle plate of the grip has a good result
One cause of these artifacts may be hidden, but "set as to render", objects. If some of their faces might overlap to your active object during the baking.

Even your high poly object can cause this if you don't correctly enable the option "bake selected to active".



Example:



Low and highpoly



Object are in the same location, so faces overlap themeselves or are occluded



Image above is the baked with with the option disabled



This is if it is enable. You must select the highpoly, and THEN the lowpoly in order to get this result.

Someone asked for a moon? :-)