lURLs are case sensitive.Generally they are lower
case. but may contain upper case letters.
lURLs may contain a forward slash ( / ) but never contain a
backward slash ( \ ).Forward
slashes are used to separate
files on the server where the web
page is located.
lURLs never contain spaces.If a space is desired, it is indicated by an underscore (_) or an unusual character, called a tilde (~ ).The tilde is generally located next to the number One (1) on the keyboard.
lMany, though not all, web addresses begin with www.