Although, I left the terms below without an explanation:
Distinct websites
Distinct campaigns
Distinct search engines
Distinct keywords
Average visit duration for returning visitors
% returning visits have bounced (left the website after one page)
Thank you so much for the comment. Well…I have written this doc just because I don’t see any help section in our Piwik so our clients could not see it (see the attached image).
I think that the best solution could be to download Piwik and install it on my personal site.
I would love to contribute to the Piwik community once the file is finished.