Dan, some of the stuff in the mags goes in cycles. There are routine articles every year about sail trim, or
layup, winterizing, rewiring, etc. And while there's often a new nugget from each author, you can also buy a lot of good
books for a basic sailing library that can bring you up to speed fast.
Offhand?
The 12V Bible (or) The 12V Doctor, or another similar book on 12v systems.
"The Best of Sail" if it is still in print, huge anthology of Sail Magazine on sail trim.
If you're into
racing, there are a few good classics for that.
Some of John Rousmanierre's
books (I'm sure I've mangled the spelling) on heavy
weather, yacht characteristics, seamanship. And some other classics on those lines.
I think Don Street's two volumes "Offshore Cruising Yacht" (and I've probably mangled that title too) are still in print, or available used.
There's a LOT of good stuff out there, and before the
internet and used book sellers it was awfully hard to find. The mags are good for updates and cruising articles, the specialty and niche mags even better in their areas, but if you want reading material...there's more meat in the books.