DBs are very easy to utilize.
insert
http://www.w3schools.com/php/php_mysql_insert.asp
retrieve
http://www.html.net/tutorials/php/lesson20.php
(I prefer
while loops when pulling data from DBs.)
If you look up
content management system tutorials that would be a good source to learn alot. Those systems add, edit, and delete information from data bases through the use of html forms, and various PHP code.
That would demonstrate how to do it all in one tutorial.