Board Thread:Support Requests - Designing Your Wiki/@comment-33135217-20200910195025/@comment-9605025-20200911040525

Preaload templates define what content is preloaded. InputBox is how that defined content gets added to a new page. To be more precise, getting your defined preload template to paste its content on a new page requires use of the URL query string parameter "preload" (as described on the help page for preload templates). However, users are usually not use to manually manipulating the URL and, even if they are, probably don't know which template to preload. InputBox solves that issue by providing a text box that users enter the page name into and then a button they can click that takes them to the correct URL. On the help page for preload templates, the example actually uses CreateBox. CreateBox is the predecessor of InputBox.

The easiest way to tell if you are on a UCP wikis is to check for a feature that UCP wikis don't have. Here are some pages you can try going to. Another way to tell is to go to Special:Version. Under the section "Installed software", there should be a table listing products in one column and versions in the other. Find the row for "MediaWiki". If the version for MediaWiki is 1.19.24, then you are not on a UCP wiki. UCP wikis are currently on 1.33.3. Yet another way is to attempt editing a page and see what editor you get. These are just some of the ways to tell if you are on a UCP wiki or not.
 * Special:FilePath - rediracts to Special:Redirect/file on UCP wikis
 * Special:Videos - redirects to Special:NewFiles on UCP wikis
 * Special:Images - doesn't exist on UCP wikis
 * Special:WikiActivity - doesn't exist on UCP wikis
 * Special:MultipleUpload - doesn't exist (yet, fingers crossed) on UCP wikis

As for how wiki coding works, Help:Wikitext is a good place to start. For infoboxes, the page Fandyllic and I already linked to provides a good overview. For detailed information on each available tag, see Help:Infoboxes/Tags.