[OSM-newbies] How to work with layers

[Bob Hawkins]

I understand working with layers on lines only to the extent of a road over a railway, say, and applying 1 or -1 to either as applicable.  This does not appear to work with a line and an area.  I have two buildings connected by a bridge and a road running underneath the bridge and between the buildings.  The principle of another mapping application that I used to work with was that points appear on top of lines and areas and lines appear on top of areas.  Is it possible to place an area on top of a line?  If so, what key(s) and value(s) must I apply to achieve the correct appearance?  Is there a tutorial for working with layers?  All my editing is in JOSM.
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