Based on my experience, Google searches rarely surface high quality blog posts, articles, and insider analyses. Twitter + LinkedIn have an SNR problem. HN is great only for the (primarily US) tech/startup scene, and other similar sites often lack the community standard or size to maintain a consistent flow of worthwhile new content.
What hand-curated newsletters or websites do experts in any field find incredibly useful? A recent example I've found is Mattermark's daily email newsletter, which has a curated list of 5-10 articles and blogposts from investors and operators.
Open to lists that aren't career related too -- ie: a jazz playlist curated by professional jazz artists.
On nothing to do with tech: I'm desperately trying to find something that covers general world news without too much of a US slant, in a nice concise way. Next Draft (mentioned elsewhere in this thread) is pretty good, but is very US heavy.
When I trialled subscribing to The Economist their Espresso app-- which is essentially a daily curated newsletter-- was pretty decent, so if you sub to them you should definitely check it out.
These days I'm trying the qz daily digest, which I think is working out OK: they talk about what to expect in the next day, what happened while you were asleep etc. If anyone has any better suggestions I'd love to hear them: I like how the economist actually talks about other parts of the world apart from the states, but I don't love it enough to pay their standard sub rate.
In terms of general flowery writing I get emails from Medium based on what I've read, emails from Pocket based on what I read, and longform.org's newsletter. Depending on how snowed under I feel at any given time I either just delete them without opening them, of potentially skim them to see if anything is interesting.