Which newsletters, digests or other curated resources would you recommend for solo entrepreneurs?

As you know, if you're building an online business on your own, there's a lot to research, figure out and actually do, in order to get your products or services out there and generating income. And when time and resources are tight (which they inevitably are), you really want to be able to cut through the crap and get to the good stuff (best way to do A, B or C) ASAP. Easier said than done without getting lost downtime-sucking rabbit holes though.

So, if a fellow solo-entrepreneur asked you about tips, newsletters worth subscribing to or other curated resources that you've found helpful, useful and a bit of a go-to in this regard, what would you recommend?

Thanks