Module development and code questions

I have trouble making AVIF compatible with Drual 11.

Thought it is natively supported, but in node editor's image upload, I cannot see AVIF in available image type list.

I tried to add it to 

I spent a whole day trying to display a url query from a view with exposed filters that would display the names of the terms instead of their IDs. Only to discover that the only way to do this is to enter the referenced field as a required relation in 'relations' and the same field again as an exposed filter, specifying the filter identifier of the referenced field.

Great, but there's the small problem that the exposed filter is a plain text field, which is of little use to a user.
So I try to turn this text field into a drop-down list.

Hi there, 

I'm working in a module to alter a form (bee reservation form) and i want to send emails to node author and email address from the form.

At this time, a can alter the form (OK), stock the fields values in session, but no way to send emails....

This is my code with e lot of logs alerts. It stops in "Stored form values in session..." notice.

Hello.
I configured ckeditor5_mentions module, it works when creating an article and when editing, but it doesn't work with comments. Can anyone know what could be the reason? There are no errors

Hello, community.
I want to finalize the ckeditor5_mentions module. It works, when you type @ it gives a list of community members. But I need some tweaks. In this list I want to display not only user logins, but also their real names.
For example, we enter @john
and the drop-down list will show blocks with the following content. For each user, the first line is his real name, and below is his login with @.
For this purpose I added lines with real name in MentionAutocompleteController

Hi,

Google Analytics module is incompatible with my Drupal 11.0.5 site. So I tried to install it, but get an error message. Looking through the reports there's this backtrace (see below). Anybody knows what's going wrong here and how to solve it?

Backtrace report (changed the actual website location with WEBSITE):