The category intersection tool makes it possible to choose two categories and get a list containing only the articles that are in both categories. You can intersect more than two categories, but you have to do it with different code, so first we'll cover doing only two.
To use it, you first need to turn on the 'category intersection' gadget. You'll need to register an account if you don't already have one. Once you're logged in, go to your preferences, which can be reached by clicking here (which will take you directly to the Gadgets tab) or hovering over your profile picture in the bottom left corner of any Wookieepedia page and clicking 'My Preferences' on the menu that pops up. Then navigate to the 'Gadgets' tab and click the checkbox next to 'Enable the category intersection tool', which is the second from the bottom (underlined in red). Make sure to click the red 'Save' button!
Once you've got it enabled, click on, for example, Category:Females. The category page should look like the picture below (the 'category intersection' link is underlined in red). If you can't see the 'category intersection' link, you haven't turned the category intersection tool on properly—feel free to reach out on WP:DISCORD for help!
There are two ways you can do a category intersection: via a template or manually. Using the template is much easier, but it's also a good idea to know how to do it manually because sometimes that's quicker. The template will not work unless you have the category intersection tool turned on.
Template
To use the template, you're going to need to put it on a page. There are several options: for category intersections that you want to come back to in the future, you can use your userpage or a workbench. If it's something you're only going to use once, you can just hit 'preview' after putting on one of the pages that were just mentioned and click on it from there, or you can use the Jundland Wastes.
Once you've got the edit page of whatever page you chose open, copy this code and then replace category1 and category2 with the two categories you want to intersect.
{{Catintersect|category1|category2}}
For example:
{{Catintersect|Females|Wookieepedia Featured articles}}
Results in:
Category intersection:"Females" and "Wookieepedia Featured articles"
and
{{Catintersect|Females|Twi'leks}}
Results in:
Category intersection:"Females" and "Twi'leks"
Before you click on either of those, please read the section below that starts with Category intersection results page.
Manually
Go to Category:Females. Click on the 'category intersection' link, which is to the left of the CANON and LEGENDS banners. (Clicking on those banners will take you directly to the category intersection of whatever category page you're viewing and the continuity banner you clicked on.) This link is underlined in red in the previous image, above the "Template" header. The first category field will automatically be filled with Females, since that's the page you were on when you clicked it, and all you have to do is enter the name of your second category.
Category intersections results page
When you click the red 'GO' button (or click on the link the template has given you), it's going to direct you to 'Blank page', which will say 'This page is intentionally left blank'. Don't panic! It should redirect in a moment without you doing anything to a page listing all the articles that are in both the categories you selected. If it doesn't do that, you haven't turned the category intersection tool on properly. Your results page should look like this:
Advanced: intersecting more than two categories
In order to do this, ignore everything you've just read because none of it applies. You'll probably want to use a workbench or some other user subpage for this, because it's more involved than the template. To do it, you use DPL because you can't do it manually or with a template. Instead of directing you to another page, DPL is going to give you every result in a list on the page you put the code. Because that can be a very long list, you can put the DPL code inside a scrollbox, like this:
{{Scroll_box|content=
<dpl>
category = Females
category = Humans
category = Jedi of the Jedi Order
resultsheader = \nNumber of articles = %PAGES%\n
</dpl>}}
Which is going to result in this:
It's worth noting that a DPL query on Wookieepedia is never going to return more than 500 results, so you'll have to either pick different categories if you want to see all the options, or narrow it down by other means. You can go here or here for more ways to use DPL, including ways to narrow the results. For instance, you could narrow an intersection of Females + Humans + Legends (which is an intersection that returns 500 results) by specifying only titles that begin with 'A', with titlematch=A%:
{{Scroll_box|content=
<dpl>
category = Females
category = Humans
category = Legends articles
titlematch=A%
resultsheader = \nNumber of articles = %PAGES%\n
</dpl>}}
This help page was originally written by User:Dropbearemma.