Views

function MYMODULE_views_pre_render(ViewExecutable $view) {
 if ($view->id() == 'ABC') {
  $view->setTitle('MY CUSTOM TITLE');
 }
}

On drupal 8 every elements (almost) are an entity, as any entity you can render a node.

All views templates can be overridden with a variety of names, using the view, the display ID of the view, the display type of the view, or some combination thereof.

Step 1. Create a custom module and add the HOOK hook_views_data_alter(&$data). Here module : mymodule

Step 2. Alter views data, Example

This tutorial show toy how to insert an existing views into a custom page or custom block.

Once created your entity as Basic Entity or Full Entity, you can add a custom views handler.

Example : Change title

There are several methodes.

Change date format Using custom module.

Group exposed fields of a view exposed form.

1. Install the module "Better Exposed Filters" (BEF).[drush en better_exposed_filters -y]
2. Go to : THE_VIEW-> Advanced -> Exposed form
3. Set : Exposed form style = Better Exposed Filters

Filter contents from two different content types with two different fields.

1. Add two fields to the field list
2. Add "Global: Combine fields filter"
3. Add conditoin EX : contains 1