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Technical editing is a term for editing within a specialty field such as medicine, computer science or engineering. While it is helpful to take a technical writing or technical editing course (available online and through some universities), it may be even more helpful to have direct experience in the field in which you want to work.
A skilled and experienced technical editor can command higher pay than a generalist editor, so if there is a technical field that interests you, it will be worthwhile to develop this specialty. As you market your business, make it a point to pay attention to recent news governing your subject area and the current publication environment in that area.