Drupal 8.x

As someone trying to move to Drupal 8 and learn composer it's frustrating that just when you think you have something new down, the whole process is uprooted and a long tutorial about how to update everything to use the newest composer method is now on my plate.

I am trying to migrate a Drupal 7 site to Drupal 8, however, I keep getting this error;

Resolve all issues below to continue the upgrade. The d6_library_transaction plugin must define the source_module property.

So I followed the recommended steps just as it says but the error above says something about plugin needing to be defined. 

Hi!

It's a fresh installation and the HTTP (http://drupal.datanoa.com) version works fine but the HTTPS (https://drupal.datanoa.com) version is not loading CSS.

Do you know what could be the problem?

Hello, hope I find help here

I tried to update the module Geolocation Field 8.x-1.11 to 8.x-3.0-rc6 to benefit from the leaflet openstreet map feature instead of google maps

but the update doesn't show in the admin page and when I open the available updates page it shows the following  

I have an issue with creating a node via the API. I have the correct permissions setup but it seems like a glitch somewhere in the permissions. An admin can create a content but no other role can. [content type]: Can create new content permission is checked.

Error; `access denied - /node?_format=hal_json`

I am on 8.8.1 - can upgrade if the issue has been resolved in the latest releases.

Config;

I am using paragraph module to create a structure that has images in it. In one of the columns based on data from the backend I want to upload image. the backend looks as below: