Drupal 8.x

Regarding Drupal 8, do updates need to be installed in sequence?  I notice updates are released monthly.  If updates are missed for several months, do I need to go back and install each one or just go to the newest current release? 

How do add a banner written in JavaScript as either a floating tab or a header bar?

I am trying to add a link to an image in the body field, but every time I do, the link appears above the image.  Can anyone tell me why?

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I uninstalled the Seven theme and re-installed it choosing to "Install & Set as Default"

I am trying to do a first install of Drupal on a Fedora 27 system with Postgres and am having problems. I mostly use Postgres and am used to that so I set up a Postgres database (named durpal) and a user (also named drupal) and made sure that the user could get to the database over TCP. I am installing on a server that I use for testing other Postgres processes, A local VM.

We have a webform on our site where users can schedule events at our business. We want to use the datepicker to help users enter in the date field. When I view the webform itself, the datepicker pops up. However, when I post the webform on a form page our the site, the datepicker doesn't show up. Does anybody know why this might be?