IDK how much more of this you want to read about. But, I'll just try to bolster the crux of J¨¹rgen's reply by referring you to Wikipedia regarding the .
I'll also add that the "first approach" they describe (re-entrancy, local store, immutable objs) is often the approach people tend to overlook. This may happen because one doesn't need extra tools for the first approach, it's basically a "style". And, I suspect if you show someone a "thing" (mutex, semaphore, etc) they remember it more than if you describe a "way" (don't share data, put everything on the stack, etc).
Well, I'm not an educator so that's all conjecture.
The second approach, otoh, can't be avoided in some cases... often when dealing with physical resources. Anyway, you should choose the approach which suits your given circumstances. Only experience and judgement will help you know which. I'd err toward the first approach if there are any doubts. But again, the first approach doesn't often come naturally until it's practiced a bit... and sometimes it's not worth the extra mental gymnastics.
As usual, YMMV.
buddy