I downloaded and set the mediawiki software, but I was wondering how I can get a reduced copy of wikipedia as my goal would be to try to "develop" an extension for wikipedia. To do this, since I'm not an expert programmer, I would need to test my lines of code on a local copy. is it possible to get it? if you could explain to me how to obtain and configure it, I had read somewhere that it could be done but it did not explain how.
Topic on Project:Support desk
https://dumps.wikimedia.org/ or https://www.mediawiki.org/wiki/Manual:Importing_XML_dumps
Thanks so much
just fyi, importing a site as big as (en) wikipedia is probably a challenge in and of itself. I strongly reccomend importing some small wiki instead
My goal would be to download a minimal version because I only need to verify / test the extension that I want to develop, I am not interested in downloading the entire version Wikipedia, I can always find the light version on those links that I have did they send in the message above? 
You can use wikipedia:Special:Export to export only a set of pages from there.
thanks so much for your help