Google
One of the simplest things you can do is open Google in your internet browser and type in the question. You’ll usually get a lot of results, but they are generally listed in order of relevance.
Adorama
B & H
Many online vendors, such as Adorama and B & H have a lot of information about equipment and general photography. These sites have a search features that can help you locate information quickly.
Wikipedia
Wikipedia is an online encyclopedia that is written by people across the world. There's a lot of good information here, but be aware that some information may not be 100 percent correct, so it's best to check your facts through additional resources.
Many photography magazines have content on the web that is searchable.
Amazon
Barnes & Noble
Amazon.com and Barnes & Noble often have sample book chapters available to read without charge. You can also find plenty of product information on these sites, as well.
Check your own photography books, camera manuals, lens manuals, flash manuals, etc.
of course, you can always go to your local library. The librarians will be happy to help you in your quest for knowledge!
Other members may be able to point you in the right direction. They may also have specialized equipment you could photograph or pictures you can use, so check around! Feel free to contact our webmaster, Mike Collins for additional help.