Here's 7 I enjoy:
The tools recommendations in Dense Discovery (https://www.densediscovery.com/).
The productivity insights from Chris Bowler (https://chrisbowler.com/newsletter/).
The Obsidian tips and resources in the Obsidian Roundup (https://www.obsidianroundup.org/).
Harry's Marketing Examples (https://marketingexamples.com/).
The growth tactics in Demand Curve (https://www.demandcurve.com/newsletter).
The 'cool tools' in Recomendo (https://archive.recomendo.com/).
1 business tip in Justin Welsh's The Saturday Solopreneur (https://www.justinwelsh.me/blog).
The 3-2-1 Newsletter from James Clear (https://jamesclear.com/3-2-1).