Thread:Purplatypus/@comment-28395802-20160517135132/@comment-24672610-20160517235006

The source editor can do that too! When you start typing a page name after [[ it pops up a list of suggestions. (Either way, though, it's good to check for the page separately to make sure it's the real page and not just a redirect.)

For linking subheadings, you add a # then the subheading name:

Collection Quests becomes Collection Quests.

If you're concerned about typing it exactly right, you can always navigate to the page, click on the subsection you want in the TOC, then copy-paste it from your browser's address bar.