Theme development

I'm... I guess an "intermediate" Drupal developer. Still branching out, still learning new facets of Drupal. I appreciate this opportunity to pick your brain.

Hello,

I've just downloaded the newest version of Drupal (9.1.3). Because many older blank themes (e.g. Zen) are not compatible with Drupal 9.1.3 anymore, I have problems developing my theme. Also instructions on how to convert an html5 site to a Drupal theme are not up to date.

Can someone please help me with converting my html5 page to a drupal theme, or give me advise on which Drupal theme to use when developing a new theme?

Thank you!

I have a sub-theme based on Barrio. My site's maintenance page uses a Barrio theme stylesheet.

How to ignore this stylesheet ?

https://git.drupalcode.org/project/bootstrap_barrio/-/blob/5.1.4/css/mai...

Here is the info file of my sub theme :

bootstrap_subtheme_front_office.info.yml

I'm trying to change Bootstrap colors, but it doesn't work. Here is the error message :

Hello, I wanted to uninstall the Views Bootstrap module and I have done so successfully.

However, when I look at my list of modules, I can still see it in the list. Therefore, I tried to uninstall again, but I am unable to uninstall it a second time as it is not in the "Uninstall" list of modules.

When I try to install the module again, it says that the module is already installed. What should I do?

Hello,

I'm following some tutorials on Drupal and sometimes it says to turn off certain modules. For instance, here I have to turn off the "Comment" module, which is in the "Core" section of Drupal. However, I am unable to turn it off. For some reason, I cannot modify any of my "Core" modules (it shows up in light gray and I'm unable to select or unselect them). Any reason why?

Thank you!!