Paste the exact command you tried and what it returned, please.

Check current path by typing pwd

If you want to be able to use cd MyDocs (make sure the capitals are correct), you need to be in /home/user/ . So typing followed by enter shows your current location.

Use tab to auto-complete path names and program names. Not only does it prevent you from making typo's, but also, if "My", followed by a tab, does not auto-complete, you know there's something wrong.