Linux Weekly News focuses on substantive technical content, like today's article on the Linux kernel's use of the switch statement: https://lwn.net/SubscriberLink/794944/a5770e282352a2e6/

Or today's article on the CTF debugging format. They're pretty much the only resource aimed at intermediate or advanced developers that's written to be highly technical but not academic.

Referring to https://lwn.net/. It has a subscription plan to fully access their content at 7$/mo.

Linux Weekly News - https://lwn.net/