Drupal 8.x

Hi all, I'm a Drupal newb experimenting with my new lightning Drupal 8.8.1 install.

I think I've succeeded in proving to myself I don't know what I don't know, so not sure how to ask. :D

I'm trying to accomplish something similar to a FAQ workflow, so I've looked at those type modules.
But instead of FAQs, I want to collect ideas.

I run two Drupal websites on Bluehost.  One is at 8.7.7 and one is at 8.7.5. Both sites are at PHP 7.2.26.   The sites are text only and not that large.

Recently, Bluehost moved my sites to a new server and the page load time got very long (about 12 seconds).  The site at version 8.7.7 is larger and slower.  The site at 8.75 is smaller and not as slow.  I spoke with the developer who upgraded my sites and with Bluehost.

From the developer:

I would have Bluehost enable the PHP Opcode Caching as it should help.

Hello,

I have not done Facebook pixel before. I searched online and could not find anything for D8. Can you give some suggestions on how to add Facebook pixel to D8 site?

Thanks!

My site fell over on updating to 8.8.1 No information of significance in the Watchdog table and the PHP error log is full of  "Uncaught PHP Exception Drupal\\Component\\Plugin\\Exception\\PluginException: "Plugin (paragraphs_actions)" messages. Drupal.org seems to have given up on troubleshooting; you seem to have gone all Apple on us ("the user is an idiot - let's keep him/her as far away as possible") so the support documentation is either for that idiot or for developers. Those of us between those two extremes are now left unsupported AFAICS.

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?