Timing Constraints Material

The quick answer is the QuartusII handbook, volume 3 - Verification, section II - timing analysis.

http://www.altera.com/literature/lit-qts.jsp

The whole handbook is 31 MB and has plenty of detail. Keep in mind the synthesis, place and route engines have plenty of discussion about meeting timing, because much of that is timing driven. Timing Analysis is separate. Also be mindfull that there are two paths to go down for timing analysis, classic and TimeQuest. Choose up front which way to go. If you only want some basics, like global clock domains, clock-to-out's, and Tsu's, Classic is fast and easy. If you want more in depth, TimeQuest has the power.