Module development and code questions

Hello I'm new in drupal, I have a problem with drupal 8.8. The site has a custom module, to obtain data from an API. After editing the source code of it. Clear the cache, restart the server and manually execute the cron, but still the changes are not observed, do I need to do something else? What i'm doing wrong?

in a form after checking on the user I would like to display a msg with a modal window, so that the user is forced to read and then move on.
I currently use \Drupal::messenger()->addMessage()

I am very new to drupal and trying to find this solution using hooks. i have to find a way to change unordered list item to ordered list items

I have a page located here where the pagination does not show despite having it set in the backend to show and the following link is the page with the pagination not showing -> PAGE WITH ISSUE

You will have to create an account to test it as it is a members page. You can add items to your lab by going to this link and clicking any of the mylab+ buttons on the right side. Add 6 or 7 -> ADD THINGS TO LAB

Hi,

I'm very new to custom modules and was wondering if it's possible to create a module that basically runs a quick script.

Basically - I want to check if the URL the user is on contains certain things and if so, check for a token (or cookie or something), and if that exists grant access to the page. But if the token doesn't exist send them to a login page where they simply enter a password, and if the password is correct, add the token and grant them access.

Goodnight

I am in the project of a website for sales and delivery of pizzas and fast food, I started the project using ubercart but due to problems I have decided to migrate it to commerce 2.

But I have been having a small problem when activating the shipment in the customer's order and this happens to review the order, the site tells me this error.

the site encountered an unexpected error. Try it again later.