For responsibile learning, focus on pencil, paper, and books.
Very narrow minded approach, why not use the tools available? Experimentation is one of the best ways to learn, breaking stuff is a great way to learn. Doesn’t mean that people won’t fall into some traps along the way, but that’s kind of the case with anything.
This is along the lines of “for responsible parenting, never let your kids out of sight”.
I love old school research using books, however the advantages of connected information cannot be understated.
We could do much better with access to online libraries (which don't exist, apart from the very limited sample from these books accessible using Wikipedia).
Current (blogs and articles and forums) online resources provide information at a rate book search just can't provide.