What are your favorite newsletters to subscribe to?

I can't recommend https://restofworld.org/ enough.

It's a semi-regular question. Threads from this year

Ask HN: What are the underrated newsletters you like reading? https://news.ycombinator.com/item?id=22280939

Ask HN: Which newsletters do you subscribe to? https://news.ycombinator.com/item?id=24723744

Ask HN: What RSS feeds/newsletters are you subscribed to? https://news.ycombinator.com/item?id=24519682

Ask HN: Best Curated Newsletters? https://news.ycombinator.com/item?id=25225755

Ask HN: What newsletters do you subscribe to (and read)? https://news.ycombinator.com/item?id=25002835

Ask HN: What are the best daily/weekly newsletters? https://news.ycombinator.com/item?id=23543539

If you're into art checkout https://randomdailyart.com newsletter.