This tells you how to invoke the command and includes command line options.
Description
Tells you more about the command.
Options
Explains the options that a command can accept, command line options modify the way in which a command works.
Examples
Shows you how to use the command, this can be one of the most useful sections if you find an example that does what you want.
Files
Tells you which files this command uses or depends on. Especially useful for system administrators types.
Bugs/Warnings/Restrictions/Diagnostics ...
Commands are qualified near the end of the man page, this area can usually be ignored for simple invocations of commands but is the first place to look if you encounter problems.
See also
This is usually a list of related commands, or a list of a family of commands. Think of it as a primitive hyperlink.