Drupal 8.x

I'm porting my first module from Drupal 7 to Drupal 8 and 9, the module itself works, but now I'm stuck on the hook_install. The purpose of my call to hook_install is to create some directories in the public files directory as well as copy some files into them.

In Drupal 7 I used "file_prepare_directory" to create the needed directories. In Drupal 8 this still works, but is advised against since it's deprecated, But it's removed from Drupal 9.x. So I've found it can be replaced by 

So I've ran a few Drupal 7 and 8 websites.

I've never used composer. On the few times I've tried I run into errors so stuck with the old method of uploading modules via ftp.

I think its time I got this sorted.

I was trying to install the twitch oauth2 package and got an error.

I want to display the register form in a modal. For that, I created a custom plugin block which returns the rendering of the form register.

I'm not a programmer so I tried looking for a module that can fetch data from external api and then render it live. I found one called External Entities but it doesn't work with the api that I use as it gives this error: The "list" entity cannot have a URI as it does not have an ID the api is https://api.adoreanime.com/api/pixiv/?type=rank&mode=month&page=1&date=2... if anyone wants to test.

Hi,

We have a Drupal website with several pages made by our developers. We had an editing course so that we could start to edit the website ourselves. I have to delete one image on a page, but there is no option to select specific contents so I could delete them,  but I can delete the whole page that contains that image, so I'm guessing permissions aren't the issue here. Is that correct? 
If so, what could be the reason I can't delete this image?