For Cortex-M embedded topics, memfault's blog is simply one of the best out there. Consistently great posts even though they are written by a bunch of different authors. I go back to https://interrupt.memfault.com/blog/cortex-m-fault-debug all the time when debugging hard faults on different systems.

Even if you regularly write embedded code for Cortex-M MCUs, scroll through their list of posts and you'll find several that will teach you something new and useful.