perlthrtut is little more that a verbose expansion of the threads pod. More reference than tutorial. All how and no why.
Imagine someone asking the question: "I want to bake a pie".
You could tell them about making pastry. You might mention the difference between savoury and sweet pastry. You could attempt to cover the need for a light touch and the affect of hand temperature upon pastry texture. You might mention blind baking. You might list some cooking temperature/time guidelines. You could talk about wet and dry fillings; and the need vent steam; and soggy crusts.
But unless you start out by asking them the type of pie they are wanting to bake; the kind of filling they envisage; and how many people they are hoping to serve; most all of that advice is just going to set them up for disappointment.
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.