I'm going to say something good about this handbook for a change of tone.

Imagine an area of work that you have no idea about. Let's say Aerospace. If someone put together a set of links and categorized the stuff you need to learn to be able to work in the field, it is immensely useful since the simple listing of the things you need to learn about itself is a learning. A 0 to 1 bit flip. Though this post is not a highly curated handbook, it educates you on what you should Google about. That is a huge win by itself.