"Unlock the Power of Wiki: Learn How to Install MediaWiki!"

How to install MediaWiki
What to do if your MediaWiki installation goes wrong.

MediaWiki website: https://mediawikik.org
Get MediaWiki at: https://www.mediawiki.org/wiki/Download
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My favourite web hosting provider: https://turnkeysimple.com

Possible installation challenges and their solutions

Cannot access the database (HY000/1045) 9:09
Cannot access the database (HY000/1045) 9:43
Cannot access the database (HY000/1045) 9:56
Cannot access the database (HY000/1045) 11:03

Why is “complete the installation” link shown instead of “set up the wiki” link 8:38
How to restart the installation 11:58
What version of PHP to use 12:52
MediaWiki Installation does not see MariaDB or MySQL database 14:28
MediaWiki 1.39 Internal error – Installing som PHP extensions is required. 15:37
Effect missing LocalSetting.php has on completed installation 17:18