Help - problem unzipping files on Terminal

Hi,
I have been unzipping files (zip and rar) using Terminal for quite sometimes now. For unknown reasons, it's given me some problems unzipping today.
When I typed cd. /desktop, as I did in the past, it suddenly showed an error:
-bash: -bash:: command not found
I typed "/bin/echo $PATH", as I saw other previous posts have suggested. The result:
/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin
I am not sure what that means, i.e. is it ok? or is it not? and how do I fix the problem if not ok?
I am completely IT illiterate, especially when it comes to any computer language. So please, a simple and straight forward answer, or preferrably a step-by-step guide, will be truly appreciated.
Many thanks for your kind assistance in advance.

MrHoffman, thanks ever so much for the helpful answer.
a "cd ~/Desktop" instead of "a dot and a space" did allow me to unzip my files finally!
Just wonder, by doing what I have just done, i.e. a dot and a space and then the target directory, had I already committed the sins of damaging the "Path" (something I learned from reading other similar posts in the forum)... Basically, I just want to know if i have damaged the file contents... and if so, how bad is the damage? (so far, my Mac works fine....)
Digress, I would have loved to stay away from using Terminal as far away as I could, since I am dreading of the thought of me ended up doing something damaging to the lovely Mac. But unfortuantely, there isn't any idiot-friendly tool available for unzipping any password-protected zip files.... Would appreciate if you could offer any alternative solution to this, i.e. other than using Terminal! (NB. I have also looked into using EZ 7z and X7zX for Mac before, both of which i just gave up in the end!)
Anyhow, thanks! : )

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