Is there a robots.txt interpreter for those of us who are newbies?

Here's my robots.txt file. Is it at least benign, and not harming my site?

User-agent: *
Disallow: /test/
Disallow: /JPG/
Disallow: /PHOT/
Disallow: /VID/

Those disallows, are MEANT to keep search engines from indexing those subdirectories in my domain, so they don't index spurious side stuff that I'm just storing in them.

Is it correct syntax?

from robots.txt http://bit.ly/2Lm9dn4
via IFTTT