Right now huggle manual at https://www.mediawiki.org/wiki/Manual:Huggle contains horrid number of subpages that users need to click through, which is horrid, believe me.
For this task, you need to have some understanding of how to organize information and documentation. You must also have some basic knowledge of editing wiki pages - see https://www.mediawiki.org/wiki/Help:Editing
It would be much more easy for user to navigate through manual, if most of stuff was on 1 large web page (via anchor links), with index (table of contents). The current layout can stay but we would link to sections on that 1 page instead of many small pages.
Any contributor working on this might want to create a proposal on a personal wikipage (e.g. a subpage under your wiki user page on mediawiki.org) and get some feedback from the mentors of this task, before actually editing/overwriting the current page (and potentially redirecting some subpages whose content is now included in the main page).