Items as of Oct 2020; things might have changed once actionable in ~2022.
* Make "Developers" link in mediawiki.org footer link to DevPortal:
** Since https://www.mediawiki.org/wiki/Requests_for_comment/Add_developer_link_to_footer_of_Wikimedia_wikis , mediawiki.org has a link in the footer called "Developers" which (ironically) links to[ ] Footer on mw: Update https://www.mediawiki.org/wiki/How_to_contribute which is //not// developer specific at all. Instead, link to Developer Portal once existing. Same on other wikis like https://wikitech.wikimedia.org/wiki/MediaWiki:SidebarMediaWiki:Wikimedia-developers-url to link to developer portal
* Add yet another item to https://www.mediawiki.org/wiki/MediaWiki:Sidebar (or remove some)?[ ] Footer on wikitech: Update https://wikitech.wikimedia.org/wiki/MediaWiki:Wikimedia-developers-url to link to developer portal
* Update links and content on https://www.mediawiki.org/wiki/How_to_contribute : It links to https://www.mediawiki.org/wiki/Special:MyLanguage/API:Web_APIs_hub which isn't too great.[ ] Footer on meta: Update https://meta.wikimedia.org/wiki/MediaWiki:Wikimedia-developers-url to link to developer portal
* Decide what [not] to do with https://meta.wikimedia.org/wiki/Wikimedia_Resource_Center/For_developers (but also see T143629), may want to either link or simply redirect or whatever.[ ] Sidebar on mw: Create https://www.mediawiki.org/wiki/MediaWiki:mw-developerportal and https://www.mediawiki.org/wiki/MediaWiki:mw-developerportal-url
* Link from[ ] Sidebar on mw: Edit https://www.mediawiki.org/wiki/MediaWiki:Sidebar : Add line `mw-developerportal-url|mw-developerportal-url`
[ ] Sidebar on mw: Edit https://www.mediawiki.org/wiki/MediaWiki:Sidebar : Remove lines `mw-bugtracker-url|mw-bugtracker`, `phpdoc-url|phpdoc`, `mw-repo-browse-url|mw-repo-browse`
[ ] Update links and content on https://www.mediawiki.org/wiki/How_to_contribute : It links to https://www.mediawiki.org/wiki/Special:MyLanguage/API:Web_APIs_hub which is meh (see T265017)
[ ] Add/update both links on https://www.mediawiki.org/wiki/How_to_contribute from `link=Special:MyLanguage/Developer hub` to full URL, and from `{{ll|Developer hub|2=<translate><!--T:25--> Software Development</translate>}}` to `[Full_URL <translate><!--T:25--> Software Development</translate>]`
* For https://meta.wikimedia.org/wiki/Wikimedia_Resource_Center/For_developers see instead {T287030}