First; let's figure out why navigation in the Terminal is not working. Take a look at this explanation and see if anything helps. Perhaps the Terminal is not opening where we might expect.
I am new to Linux and Ubuntu and have tried changing to folders/directories with some difficulty. Could someone explain why the following commands failed to change to the desired target folder/dir...
askubuntu.com
Your Bash prompt should look similar to this: user name@host name followed by the 'tilde' which is shorthand for the $HOME directory followed by the '$' which is the symbol representing that the Terminal is ready for command input.
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Here I "cd" into my Downloads folder and run a checksum command on a Linux Mint .iso :
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Can you post a screenshot of your Terminal showing the failed "cd" command?
P.S. What is "PW"?