I do not really remember how I discovered Marcus Blankenship’s advices (I think one fellow CTO shared the tip with me), but I think he’s doing a really decent work for any new tech lead or CTO.
He offers a well-automated newsletter, with each day a new advice in your inbox. Some I’ve skipped, some I’ve learnt, but overall, most seems to be really good advices, particularly when you’re beginning. I think it would have help me if I had known it earlier!
Here’s his website. Enjoy!