Why would it benefit you to try various sites rather than just get used to one? Why is it good advice to look for content as well as the date of the publication?

Answer 1

What do you think? We'll be happy to add to or comment on your answers.

Answer 2

Here's an excellent tutorial:
http://lib.nmsu.edu/instruction/eval.html

Go through the Criteria section first; then the Suggestions section; then try out what you've learned in the Examples section.