“There is no dark side of the moon really. Matter of fact it’s all dark.” - Pink Floyd, Eclipse.
I first learn about tidal locking when I was 15-ish, because it featured in The Coldest Place, by Larry Niven. That’s a story that uses the idea that Mercury is tidally locked to the sun to posit that Mercury’s far side is very cold. Problem is, it’s not. Mercury rotates 3 times for every 2 times around the sun. So Mercury doesn’t have a dark side either. Tales of Known Space mentions that it’s a goof.
Anyway, the Moon’s tidal lock, the Far Side, and that it’s the far side from Earth, is one of those things that comes up often enough in near-future hard SF that it’s difficult not to know if you read much of that.