Drupal 8.x

After playing around with Slick and Paragraphs I discovered I was no longer able to Edit a View.

When I click Edit next to any view dblog says:

Please help.

Not enabled

PHP OPcode caching can improve your site's performance considerably. It is highly recommended to have OPcache installed on your server.

im new. how can i fix?

Not enabled

The trusted_host_patterns setting is not configured in settings.php. This can lead to security vulnerabilities. It is highly recommended that you configure this. See Protecting against HTTP HOST Header attacks for more information.

its my first time. 

I have researched & tried what's been suggested, and nothing works. I had D7 multisited for years just fine. D8 is eluding me.

I'm at Bluehost. I have a primary site up & running D8 just fine; it's at public_html level. The 2nd site is a Parked domain; this is how it works with D7.

I've created a subfolder sites/2ndsite.net. In it is example.settings.php.

In sites, is an unmodied copy of example.sites.php renamed sites.php.

I just got Drupal 8 installed two days ago and started to go through the manual and tutorials, when I noticed that the edit icons (pencils) don't show up when I'm logged in as an administrator and user/1.  (I'm using the Bartik theme.)  I also noticed that none of the body fields--like the one for writing articles--have a text editor in them.  I'm able to access and edit other parts of the pages, like content, themes, modules, etc., but I was wondering if I missed something while setting everything up.  Or are these features that have been dropped from Drupal?  I searched the forum and docs

Hello, and thank you for reading!

I am inversor and I want to start small business, so I want Drupal just for one user can check his balance, and the administrator can change it, only the admni, and the user only can see.

It is a big pain, I have found a module for my Drupal 8, (I have updated it to the last core) and this module is: 

https://www.drupal.org/project/balance_tracker/releases/8.x-1.x-dev