Theme development

Tell me how to thematize this element on the page when a regular user edits a record?

I want to hide the given text in "tooltip" bootstrap 4 (bario).

Manuals from bootstrap 3 do not work

Google did not help
So it looks now:

need to do so:

I am new to Drupal and am editing a site for a new client. The client would like a footer added and from what I've read in my research I should do this through the Structure > Blocks function. Problem is, I am not showing the Blocks function as an option here. It was built in Drupal 7 so this may be the issue? The only options I'm given under the Structure tab are:

-Content Types

-Features

-Menus

-Panels

-Mini Panels 

-Taxonomy

-Views

-Contact Form

I have an autoplaying looping video on my site's home page.

this is the twig code used to render it:

My Drupal 8 Site report is giving this Media warning:

It is potentially insecure to display oEmbed content in a frame that is served from the same domain as your main Drupal site, as this may allow execution of third-party code. You can specify a different domain for serving oEmbed content here.

 I've been searching various forums and reading Drupal documentation but I cannot find an explanation for how I can fix this warning?

Hi, I'm using Drupal 8.8.1

I created a module for generate rss feed. I created an twig template file podcast-rss-feed.html.twig under templates folder , below is my code: