They are usually right up against the house and about a foot wide. They have a garden tie border that is flush with the grass (makes is nice and easy to mow with no weed whacking) then filled with rocks, usually those white ones. What are they called?

I was informed by a home inspector that they are very good to have. The previous owners had gardens up against the house that of course require water. (Right up against the foundation.)

Where can I find some good information about working on a project like this? How deep should it be and what should it be lined with... if anything? I am thinking the black cloth material to prevent weeds from growing, but wouldn't a bed of rocks let more rainwater pass through than a garden?