Diffuse categories (recategorize pages so that they go to subcategories of current category)
Often pages are included both in the category and its subcategory which is rarely a good thing. Remove the parent category from the page in this case.
Use HotCat (see ad on the top) when you need to fix one page.
Use StubSorter when you need to change stub templates.
Use Cat-a-lot when you need to move many pages at once to the subcategory.
Category:Free software once had over 400 pages. I went over each page and recategorized it by including a category like by open-source license used or programming language it was written in. There are still many categories like this: Category:Overpopulated_categories
Fix spelling mistakes (typos)
Type in the search box some word with a typo (for example, "funtion" or "for for" - duplicate words).
When you search for duplicate words, use double quotes and regex
For example, I adopted the typo "the the", so when I search for duplicate "the" I type:
If there are pages with this typo, they will all be listed.
Go to these pages and fix the typo.
^"the the" insource:/the (\[\[[^\]\|]*\|The |\[\[The [^\]\|]*\]\])/ - this for capturing duplicates with internal link texts (Click here to start fixing these), AutoWikiBrowser can be very useful here.
Merge duplicate references
Sometimes there are duplicate references (which have the same links or their links go to the same page).
In that case, add <ref name=(unique reference name - usually author or first words from title)> to the first reference, and then replace all other duplicate references with <ref name=(reference name)/>.
This template can be used to reference certain pages from a book.
Wayback Machine often has saved versions of the page with various dates - before choosing, look at access-date= or at Retrieved: and choose date which is closest and has the page with relevant information.
Add archived link to reference:
If reference used {{cite web}} template, add archive-url=(url from wayback machine), archive-date=(date of saved page) and url-status=dead.
If it is an external link, use {{webarchive |url=(wayback url) |title=...}} template.
Unfortunately, sometimes Wayback Machine doesn't have saved page. In that case, add {{dead link|date=February 2026|fix-attempted=yes}} directly before </ref>.
Improve references with bare URLs
If reference doesn't have title= or it is empty, click the link and search title there.
It is often missing date= or author= (first=, last=, first2=, etc.), and if the page has this information, add it to the reference.
