I have a problem when exposing the wires in the cables. I often cut a few strands of the wires when I like to expose the wire at the tip of the cable. What is the technique in removing the outer covering of the cable without cutting the wire strands?
You can use wire strippers, or you can carefully use a razor blade to cut through the insulation. With a lot of practice, you may find that you can use wire cutters, with the jaws held just close enough to cut through the insulation without nicking the conductor.
Wire strippers were made precisely for this job. Places like Harbor Freight is where you can get them on the cheap. And I don't know what they're called, but there are razor knifes that are thinner than most which would work well too.