nushell/docs/commands/cd.md

If you don't know about it alreaday, the cd command is very simple. It stands for 'change directory' and it does exactly that. It changes the current directory that you are in to the one specified.

Example -

/home/username> cd Desktop
/home/username/Desktop> now your current directory has been changed

Additionally, .. takes you to the parent directory -

/home/username/Desktop/nested/folders> cd ..
/home/username/Desktop/nested>cd ..
/home/username/Desktop> cd ../Documents/school_related
/home/username/Documents/school_related> cd ../../..
/home/>

And / takes you to the root of the filesystem, which is / on Linux and MacOS, and C:\ on Windows.

If no directory is specified, it takes you to the home directory, which is /home/your_username on MacOS and Linux systems and C:\Users\Your_username on Windows.