The exact method of creating the alias depends on the shell
environment you are using. For ksh, you could do the following:
alias lt="ls -lt"
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There is no "default" Unix shell. Different Unix vendors shipped
different shells.
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The first shell was 'sh', the Bourne Shell
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A Unix shell can be obtained in Cygwin, a Unix compatibility
layer used to compile Unix programs and run them on Windows.
Microsoft also makes a shell known as "Windows PowerShell" which
incorporates more Unix-like features than the standard command
prompt.
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The a default Unix shell is the shell that comes with and is
activated initially with your distribution of Unix. The shell is
essentially the program the runs the command line interface
allowing someone to interact with their computer. Some examples are
the Bourne-Again shell (bash) or the Bourne shell (sh).