I recently found out about the ancient roads in China. These days they are hiking paths. I'm quite used to handling myself alone with a GPS track, I don't want a guide. I found one book that it's not remotely clear if it's got what I want as it's discussing much of China and it's old enough I'm not sure what the mapping info will be like.

It can be a bit outdated, but then you just update it as you do your research ;)

  Seoul is not a pretty city, at least not by most Western standards of beauty.
  It is a sprawling, haphazard mix with little apparent cohesion beyond a shared culture.

While planning the trip, I was annoyed by redditors on r/askswitzerland ending almost all replies by asking folks to download the SBB Mobile app. To my surprise, even though I'm not the kind to install apps (let alone Flutter apps), it was god-sent. So well made (their "design system" is open source: https://github.com/SchweizerischeBundesbahnen/design_system_...). Makes travel up and down the country, from Zürich to Lugano, from Genève to St. Gallen, from Basel to Campocologno, stress-free.

For tourists, TooGoodToGo.com (mystery meals) & SwissTopo (trails) are equally neat.