Drupal 8.x

Hello there,

How do I build a form with :

• optgroup select for subject
• conditional display of informations depending on the selected subject
• conditional display of a part of the form if a checkbox is ticked

Cheers!

Example :

[ Subject <select> <optgroup> ⌄ ]

Conditional display : The content below varies depending on what is selected from the drop-down menu.

The client wants to have a separate field for mobile specific. For example, the banner section - Image upload option is provided. Here there should be an option for mobile specific, so that image will be displayed only in mobile/tablet view.

How to configure this specific part? 

I have upgraded using below command

drush pm-update

After update it gives below error

Fatal error: Class 'Aws\S3\StreamWrapper' not found in //web/modules/contrib/s3fs/src/StreamWrapper/S3fsStream.php on line 23

Any idea how to fix this?

Hi,
I'm creating a site on Drupal for the first time
I'm using Layout Builder to display news. I add a title block, but it displays as span:
<div class = "content">
       <span class = "field field - name-title field - type-string field - label-visually_hidden"> Title 1 </span>
     </ div>

how to change it to h1?

Thank you.
ps. sorry for my English

I just went through a lengthy process of updating Drupal 8.7.10 to a Composer-managed 8.8.x setup using this helpful guide. It was successful, but I failed to realize that those instructions installed a dev version of 8.8.x (I assume it was written before 8.8.x was stable). I used the following code (from the guide linked above) to install Drupal 8.8.x:

I'm a total Drupal newb. :D
I have a fresh install of Lightning Drupal 8.8.1

I'm looking through the list of modules, to learn what is installed and what I might want to enable.

I cannot find any info about the module: Simple OAuth Extras
Machine name: simple_oauth_extras

If anyone has a link to the module info page, that would be great.

Is it common to get modules installed by Distirubions that have no info on the Drupal web site?