Where possible, I try to document alternatives to #emacs packages I've written. It helps discoverability. ag.el has an alternative: helm-ag.
miniblog.
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I'm a huge fan of Swift's 'Error Handling Rationale' design document: https://github.com/swiftlang/swift/blob/9315673c003875158852579bd1f33480cdec5461/docs/ErrorHandlingRationale.md#fundamentals
It carefully defines terminology and compares with other languages, so you can understand Swift's position and preference in the design space.
Fun example of a bunch of YAML gotchas all in a single file:
Go has a wonderful, accessible discussion of how it does inlining today, the downsides, and the plans for 1.22: