A quick read of my notes on these two books always helps focus my attention for any writing task.
I make a point of re-reading Zinsser's book in its entirety at least once a year. It takes but a couple of hours, best 'writing skills preventative maintenance' I can think of. It's also worth re-reading my notes prior to any major writing task, which is why I'm doing it today. I think of it as 'pre-flighting my writing skills'.
Before any major writing task, I go over Strunk & White's rules so that they're fresh in my mind as I write. That helps cut down on editing time later.
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For the terminally lazy: Amazon links to On Writing Well and The Elements Of Style. (I would make them affiliate links, but I too am lazy.)
