As a technical writer, do you focus on fields that you are conversant with, or do you rely on research?
I rely on research, but I gravitated towards fields I enjoyed working in.
I started in an Electrical Engineering company, then moved to Defense, then to software. Once I found out what working for a software company was like I didn't want to work for any other kind of company.
With that said, I only dabble in coding, and only since I started working in software.
I wasn't an expert at making software, but it gave me great satisfaction to work with software, so I did lots of research on the field to learn as much as I could. But my job is not always to know how to do something, but to figure it out, then figure out how best to explain it to someone else.