If you are using the bash shell on your Linux or macOS system and want to get back to the previous directory form the current directory you are in, you can make use of the cd change directory command followed by double dots ..
Example:
bash-3.2$ pwd
/Users/c2ctech/Desktop
bash-3.2$ cd ..
bash-3.2$ pwd
/Users/c2ctech
bash-3.2$ cd ..
bash-3.2$ pwd
/Users
bash-3.2$ cd ..
bash-3.2$ pwd
/
bash-3.2$
As you can see in the above example, using pwd command, I have displayed the current location and then made use of the cd .. to move to the previous directory until I reached to the root directory.

Note that there is a space between cd and the .. , if you do not add a space you will get an error bash: cd..: command not found
$ cd..
bash: cd..: command not found
If your requirement is to go back to the previous directory and not a step back, then you can make use of the $OLDPWD environment variable.
Let's take a look at an example.
Say your current location is /usr/bin
bash-3.2$ pwd
/usr/bin
Now say you move to /Applications/XAMPP/htdocs.
bash-3.2$ cd /Applications/XAMPP/htdocs
Now if you run a few commands,
bash-3.2$ who
c2ctechtv console Aug 12 08:44
c2ctechtv ttys000 Aug 14 10:09
c2ctechtv ttys001 Aug 14 10:10
bash-3.2$ whoiam
bash: whoiam: command not found
At this moment, if you want to go back to the previous directory location, just make use of cd "$OLDPWD"
bash-3.2$ cd "$OLDPWD"
bash-3.2$ pwd
/usr/bin
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