Module development and code questions

I have created a custom edit form into which I want to load database field values as form field default values. 

Hello,

I want to switch node's form mode by a toggle button (boolean field).

Here is my code:

I'm getting to grips with custom code in D10 after several years of simple development in D7.

What code should you use in the Form Submit function shown below?  (In D7 I think it was $form_state['redirect']='pets'; to send the user to the pets Views listing.

Hello,

I developped a module having as goal to to let's say the basic CRUD operations.

For instance the GET (corresponding to read) is OK, POST (create) is OK and now, for DELETE, I'm face to an error that I've analysed but no reason found yet.

Details about my rest api implementation:

This is my uri_path:

I have a custom select query, which I then render into a list. This looks somewhat like this:

$build['content'] = [
  '#type' => 'container',
];

foreach ($results as $result_item) {
  $build['content'][] = [
    '#type' => 'container',
    '#theme' => 'container__custom_item_theme',
    '#result' => $result_item,
  ];
}

The query cannot be cached, as it is very dynamic. A single result item however looks the same every time (considering it is the same item).

Hi, previously I submitted a question about TFA issues, not sure if anyone faces this before. link: https://www.drupal.org/project/tfa/issues/3383019

Nor I have much php experience to debug this TFA session expired issue. Any advice/suggestion would be appreciated.