Drupal 8.x

Hello,

I'm up and running - did manual installation. But during install, I deselected the option for 'Available Updates'. So now when I go to the Reports tab, there's no section for 'Available Updates'.

Is there a way to add it back?

(I am comfortable with editing files/resources/db manually, I just don't know how to add this feature back. My various search attempts didn't find anything on the subject.)

Thanks!

I have created a content type and added an entity reference field so that a person can look up a file that's already in the system. I used the https://www.drupal.org/project/entity_browser project for the field. This works well enough, but it only allows me to search for a file by name. I need to search by tags, preferably comma separated value of tags with AND functionality (TAG1, TAG3 would mean TAG1 AND TAG3).

I am looking for a way to have an exposed filter consisting of taxonomy terms which can be selected by means of checkboxes.
Preferably with the possibility of multiple selections, but not necessarily, automatic update of the view after selection (ajax) is another wish.
I tried the module 'Better exposed filters', but this only seems to work on select lists.
Anyone aware of a method do accomplish this with taxonomy terms?

With the "field permissions" module, I can limit some users' rights to make changes to some areas of a content type. But I can't prevent the "Title" field of content type from being changed by other users.

I know in Drupal 8 hook_init() and hook_menu() are removed.

But how can I convert this 2 codes to working code in Drupal 8?

Hook_init()

I am using Drupal 8.6.2 with a custom module that denies access in certain cases to viewing some nodes via hook_node_access, and to downloading some private files via hook_ENTITY_TYPE_access (implemented as hook_file_access).  This custom module appears to be working - access is allowed or denied properly.