First, I want to support any mention of any Gerald Weinberg book. Every one is gold. IMO, Intro to GST is great for developing a scientific mindset, something broader than computer science itself.

I would suggest a grain of salt to go with the three-four languages at a time recommendation. I'd have to dig up a stored book to find the reference, but Weinberg typically suggests learning two different languages, at least at the beginning. He advocates for the benefits of recognizing it's possible to say the same thing in different ways. My knee-jerk reaction, knowing him, is that he picked two rather than three or four to make things manageable for people getting started. If programming becomes a hobby, vocation, and/or avocation you'll likely wind up learning most of those languages eventually.