Module development and code questions

I'm studying to develop Drupal 10 modules, I created the classic "Hello world" module implementing it with a custom string to display on a specific page.

The value is stored correctly but in the page that should display it I always see the cached value, if I clear the entire Drupal cache I see the real stored value.

In my DefaultController.php I read the value link this:

I am trying to spinup a new site with Drupal 10 and keep getting the following error:

"The website encountered an unexpected error. Please try again later."

Server side is clean, DNS and such is all correct.

First time the only change to a fresh D10 site was to change the name of the site. Everything worked at the end of the day, then next day I get the above error. I reinstalled a fresh instance of D10 because I hadnt made any real changes.

I have a custom module which implements a form using the Form API buildForm.

The form contains fields for user input and field which contain values calculated from user input fields via Ajax callbacks.

The use can enter values into the fields and the calculated field are correctly calculated and display appropriately in the form.

Hi,

For my current site I need some help in understanding best approach or Drupal standards.

Hello.

I'm asking for the community's help again because I think there is a bug in drupal core with the form #state API.

Specifically, checkboxes and lists are not activated as required by form #state.

In the case of checkboxes, the requirement asterisk is not added, but required="required" and aria-required="true" attribute are added, but the checkboxes do not become required.

The same is with the lists except that the asterisk is added, but it is not required either.

I have a list, which I use with the checkbox/radio widget, which is the master.

Hello,

I am learning module development - rendering a table

I expected to see two rows of data but it displays only 1.