Data dumps are at https://dumps.wikimedia.org/enwiki/20181201/ (currently). Article content (source code) is in the pages-articles files (e.g.
enwiki-20181201-pages-articles.xml.bz2 is all pages in a single file,
enwiki-20181201-pages-articles1.xml-p10p30302.bz2 is page IDs 10 to 30302,
enwiki-20181201-pages-articles-multistream.xml.bz2 is a single file with many separate bz2 streams). If you need all pages you are probably better off with the single-file plain bz2 format. Note the data might be in the TB range after uncompressing.
Link information is available as SQL dumps from the same page (towards the end of the list, files with templatelinks, imagelinks, redirects etc. in the name). These are 1:1 dumps of the corresponding MediaWiki tables so see DB schema information for details.
If you need the page content as HTML, your best bet is probably processing one of the Kiwix dumps (they are in ZIM) which contain a stripped down version of article HTML.