Many Internet resources are not equivalent to the
weighty tomes you would find in a library or bookshop. Broken into
screen-sized chunks, they may not cover a subject in the same depth as
a book. Some resources may appear or claim to be comprehensive information
resources, but may disappoint in that they are not yet complete, may be
full of broken links or simply lack in-depth coverage of the subject matter.
Worst case scenario:
You may find a title that is full of promise (eg
"The Internet Guide to ...") only to find that the information is only relevant to a particular country or region.
Questions to ask:
does the information go into sufficient depth?
does the resource cover the subject matter adequately?