I once asked on tex.stackexchange.com for a simple yet helpful format. Still gets follow-ups, c.f. newest one. tex.stackexchange.com/questi…
This is good thread on writing a good response to journal referees

May 25, 2017 · 1:56 AM UTC

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Replying to @eddelbuettel
I've settled on google docs w/ my responses in labeled, bookmarked boxes I can cross reference. I also use lots of screenshots of changes