Drupal 8.x

Hi everyone-this is my first time posting on these forums.

I am trying to upgrade a Drupal 8 site from 8.4 to 8.5.2, and as you might imagine I would like to do it as soon as I can!

I have tried this again and again with no success.

I share with you an example about how you create a block form and manager data with multiple field ( autocomplete ) :

1. This class for block form "a la une"

I'm hoping for some outside input on a best way forward... I believe I need some sort of many-to-many taxonomy, but I'm not seeing a way (or module) to do this in Drupal 8? But I could be wrong about going this direction. (Also, I'm trying to keep low overhead on memory. My database could get quite large with individual fields of data.

Basically, I have a couple scenarios where terminology would/could be used by multiple things: 

Hi to all, Is there a way to carry out any repair features without Drush?

I updated a few modules on our site today.. Drupal has died! Looking through the logs, it appears there are missing database fields.

Hoping someone might be able to shed some light on this. We have a Drupal 8 site hosted at Pantheon and the site configuration is locked via the "Configuration Read-only" module. I created a local clone of the site using git and added a new user but when I do a "git status" it shows my branch as being in sync with the master. With this said, it doesn't look like newly added users are written to any of the config YAML files so I suspect that I will need to export the database from my local and import it to Pantheon but this doesn't seem like the correct process or safest method.