Thats true enough too, of course. But too often people want to be spoon-fed, and so you want to point them at decent resources which they can self-study, and then be on hand to answer specific questions.

There are books such as "Linux Device Drivers", which are great resources, and there is a lot of existing code out there to read too.

The person who asks "How do I do x?" without having appeared to carry out the minimum of self-searching themselves is often impossible to help in any detail anyway.