Drupal 8.x

I'm trying to install Drupal 8 on my web server and as I'm going through the install process, I ran into the following error within the Requirements portion of the install saying that PHP Extensions need to be enabled for dom, SimpleXML, xml.

Not really sure how to go about enabling this, any insight or direction would be appreciated. (If it helps, the web server is running Apache/2.4.29 and the version of PHP is 7.2.24)

Error:

PHP EXTENSIONS

Disabled

Has anyone included a table and pagination for that table on the IPE panel? Trying to edit blocks on a page. There's two edit menus one that brings you to an edit page, where pagination works since the page links redirect you to the new url. However, when editing a block in the IPE panel the link should not redirect you to a new page. The table should be updated with the next page's content using AJAX. Clicking the link to a new page just prints ajax to the screen.

I've been away from Drupal for several years as I worked with WordPress on a small news site. When I returned to test Drupal, I realized my knowdge of designing a custom frontpage needed help. I've read differing opinions about whether to go with Views or code. What is the best way to construct custom views and bring them together?

Thanks.

Hi! I'm making my own Drupal 8 theme and I'm currently struggling with the background option that comes along with a paragraph type. There are 3 options: transparent, primary or secondary; My twig file is OK, since I can apply opacity to the paragraphs with the following CSS.
Somehow the background colors don't change at all. Anyone who has experienced this?

    .background-color-transparent { background-color: transparent; }
    .background-color-primary { background-color: rgb(201, 76, 76); }
    .background-color-secondary { background-color: #000000; }

Hello,

How can I export content and users from a Drupal 8 site and import them into another copy of same Drupal 8 site?

Thanks.