Module development and code questions

I have created a custom field programatically and installed the module. Upon module installation the field should appear in the add field list. But my field name is not appearing in that list. I have made this after watching tutorials in those tutorials the name is showing but not mine. I am sharing the code kindly tell me what I am doing wrong.

Code of .info.yml file

Hi,

1. I've create my Drupal project using the Drupal Composer Template Project,
2. Installed a purchased Drupal theme, which contains custom modules and theme to web/[themes,modules]/contrib/
3. By default .gitignore web/themes/contrib is excluded so these non-Composer custom mods/themes are excluded from git

How do I move/separate these custom modules/themes from the Composer-managed themes/modules to web/[themes,modules]/custom so I can add them to my git repo?

Hi!

I would like to use the chartjs.org to display my SQL data.

Anyone familiar with integrating SimpleSAMLphp with Drupal 8?

I'm trying to put up our Company's SSO in front of our Drupal CMS. The end goal is to authenticate via our Company's system (which has high security and 2-Factor Auth, etc.), use the person's email to look up their Drupal account and login to Drupal with that account.

Good Afternoon

I am injecting a service in my form and I am presenting the following error+

Thanks

I am creating a module that enable user's update all drupal website important setting via one admin form. like "website name," , "website email." , "Public file system path " , " Enable clean URLs " and more for example.

Please help me how can i build this type of admin form. and what hooks are used?

Thanks