For sure the aforementioned manager need to fix his communication style. That being said the core advice was indeed good.

This is considered standard practice at this point. The article does a good job explaining it and the reasoning behind it.

Looks like a nice resource to deep dive into CSS layouts and really understand their behaviours.

Looks like a nice alternative to git rebase to manage patchsets. Definitely interesting if you're using something like Gerrit. With other forges... It'll depend how your reviews are handled I think.