is the same as "tracing circuit diagrams" here in the UK.
What it means is, relating a circuit schematic to the actual physical layout of a piece of electronics.
It is a necessary skill when fault finding.
To do it, you
must be able to recognise components and read their values, or type numbers.
If working on printed circuit boards, it helps if you are able to see both sides of the board.
You must isolate the power before doing this.
To begin with,
you need a starting point.
Once you have
done this, you move on to identify other components connected to this component.
Relating the schematic and the practical layout makes fault finding much easier.
This skill is
also useful if you don't have a circuit schematic.
This skill also enables you to make a component layout drawing, using a schematic as a guide.
is something completely different.