Different database families work differently but there are similarities to all of them. There are basic search boxes in which you can enter search terms. There are often advanced search options that help to narrow the search. All databases have a "Help" button that link to pages with search tips. A sampling of instructions, search tips, and video tutorials of some of the library databases is listed below.
Ancestry.com Various help resources.
EBSCOhost offers a variety of video tutorials pertaining to various databases.
Facts on File
American History Online video tour.
Bloom's Literary Reference video tour.
Science Online video tour.
Library on the Go! setup and procedures for e-books and audio books.
Newspaper Archive FAQ and search tips.
Proqueset Newspapers general search tips.