Theme development

Hi Community, in the past I used firebug, it was easy to change website and to see where the css file to change is located. Please could you tell me how to use Web inspector (safari). And how to use it. 

Thank You 

Mibadix

I everyone, this is my first message ever in the community, i hoppe it will be a long relationship. 

Im trying to learn to develop personalized modules and controller on DRUPAL 9 with Drupal APis, etc... and i'm trapped for around 1 week now in a probably tiny and idiot problem, but the true is that i don't find the solution. Let's try to explain myself:

1) This is a controller where i just want to list a RSVP List from a query from a database.

2) This part of the code is running ok: 

   \Drupal::messenger()->addMessage(t("@person in the list:",

I have a 'card' view mode for an node bundle called 'event', which I'm displaying in a view block. The view is configured to display each event as content in the aforementioned card view mode. However, my custom theme template node--event--card-display.html.twig does not get applied.

I looked at the suggestions using mytheme_theme_suggestions_node_alter, which was the following:

I haven't used Drupal for a few years, now when I am back to my old site there is a problem I can't remember how to solve it. 

I have created a  custom theme and a template 'page--pagename.tpl.php'. It does not seem to pick the page with the name 'root/pagename'. It, however, picks and designs non-existing page if I go to root/pagename. I, of course, cleaned caches. I use local version on xampp.

Would be grateful for any help. 

Hey Guys,

The Drupal user-interface doesn't provide a way to alter the User name and password fields.

Through using a custom module, I was able to make some changes to the email and username.

However, I have not had luck with the Password and Confirm Password fields.
 

Hey Guys,

I've been using Drupal 9 for about 5 months now.. I still consider my self somewhere between newbie & Junior level.

I want to customize the Login, Registration and Password reset form..

Attempts so far: