[Johnngnky]

well because there are some people that do not know anything about Linux.

Yes obviously. I didn't know Linux a few years ago, my point is, Linux is easy to just go hands-on, it's not like SQLi, where you can't experiment.

I do understand your point of view. But there is people want direct links on learning.

I understand exactly your ideology.
I am not objecting to learning Linux through tutorials, but I personally think it's 1) waste of time, 2) not going to learn everything, as with experimenting.