Drupal 8.x

I do not know how to make a checkbox in webform quit previously disabled. Thank you.

I am trying to create a the following website. The theme has http://halaltimes.hitechsol.net.
The theme developer has created some categories such as Fashion, Food, Hospital etc. When I add an article, naturally, I had to dd it under a specific category. May I know how to to actually a display a list of the categories for me to be able to select any or some of these categories at my own free will instead of worrying about its weight and typing the name of category again and again?

Hi, Im not sure what I have done, but when I try to edit any Article or Basic Page, or any content page i get the following. Im really lost for where to even start looking. Any help would really be appreciated.

HI I have succesfully installed the SASS bootstrap subtheme. However the mobile menu does not work on click. And maintains closed.
I have been looking through the documentation and issues:

https://www.drupal.org/node/1893532#comment-8876499

I do not understand the way to fix with the Drupal 8 theme. Can someone help me in a direction?
Thanks in advance!

I am trying to access the uri of an mp3 with the field name field_audio_file so as to embed it in a source tag for an audio tag.
I have used kint to find what array the uri exists in which I think is content._field_layout.content.field_audio_file in #file.uri though I am not sure how to access arrays with a #.
Can anyone give me any suggestions?

I've got a Drupal 8 site, and I've created content types and a view for scheduling. For an easy example, we'll say it's a softball league, and the content type/view allows me to put in that on August 21 is the Giants vs. the Bombers, August 25 is the Rockets vs. the T-Birds, etc. So each game has the teams and date. I have then broken it down into two views, the first creates a, "Next Game" block, and the other creates a "Upcoming Games" block (Both reading from the same data).