MediaWiki has quite a few tools for finding pages that are underdeveloped and need a little bit of care from the community. If you would like to help out with the wiki, a good place to start is to go down this list, and look for things you can contribute to.
The Special:WantedPages page lists pages that are linked to by other pages, but do not currently exist. It is a good place to look for articles that need to be written still.
Short Pages and Stubs
The Special:ShortPages page lists the shortest pages on the wiki (which usually need care), and the Category:Stubs page lists pages that have been explicitly marked by an user as needing care. To mark a page as a stub, use the Stub template.
The Special:UncategorizedPages page lists pages that are not in a category. These are usually missing the Term template, and should have it added. Follow the instructions in our Style Guide for more information on how to do this.
The Category:Articles which use infobox templates with no data rows page lists pages which have an infobox (probably the Term template), but contain no data rows. If at all possible, change the infobox to add any relevant information. If there is nothing to add, consider bringing it up on the Discord, as the Term template is far from complete, and examples of pages where none of the fields apply would be very helpful in improving it.