Post installation

(Edited post: somehow all my images uploaded to Drupal previously are now gone. Editing and re-posting without images.)

Hi all - I know my question has been asked previously - I did research the forums and tried the suggested answers but I still couldn't get it to work.

My specific scenario: I have a view showing all the tags and the number of times the tag has been used. The Name column shows the name of the tag, Frequency column shows the number of times the tag has been used:

I am not sure where to post this, if there is a better place this question fits let me know. But I am a student website developer for my university. 

Hello, i am creating a content type on drupal11 with the capability to upload a file.

When I must write the extension type, i receive an error because the "-" is not allowed. I should use the nvda-addon extension.

Is there a manner to bypass this limitation and use the file extension I need?

Say, is there a way to make Drupal feel more like a MERN stack type of website / app? Without the page reload, mainly.
The PWA module comes somewhat close to it for the standard content, after everything is cached.
And I believe there were / are some AJAX options in views as well?
Drupal seems to be extremely fast, that's good.
I'd just like to look into the feel / UX of things.

This appears to be a new development on my site, anonymous users are denied access to various nodes.  As far as I can tell the only unique thing about the nodes I checked is that they reference a specific kml file.  There are many other nodes that display kml files without denying access.  I checked this by using Firefox to access my site as an anonymous user.  I was blocked.  I logged in and was allowed to display the node.  I have no known permission restrictions for viewing published content.

I had included a contact us form at the bottom of most of my pages, but this was deemed a bit to cluttered so I changed it to an single page accessed via a menu.  The advantage of having it on all pages was that I knew the page that interested the visitor. I lose that using a single page.  Is there a technique whereby I can retain the initial page identity and display the form on a separate page?