Taking a course, reading books, watching lectures, and actually building projects in new domains. I'm not going to learn machine learning by googling each step and copy/pasting stack overflow. I'm not going to learn how TCP works by Googling and copy/pasting stack overflow at each requirement.

Skill development is something that takes a lot of time and practice.

None of that is to say that stack overflow isn't useful, or that I won't learn things when I run into a problem by reading a blog entry. But to me that isn't the same thing as learning a new skill, unless that skill is so small and shallow that a single blog entry is all of the knowledge you'd ever need.

Something ultra-specific to this particular gatekeeping individual, I suppose.