Drupal 8.x

We migrated our content from Drupal 7 to 8. Very exciting.

HOWEVER:

A few posts show up just as they should.

Some posts can be edited, and show content in the edit field but the content does not show up when the node is viewed in either default, ful or trimmed layouts.
When I try to edit them, many return:
Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 475136 bytes) in /nfs/c03/h04/mnt/167604/domains/tgeink.com/html/core/lib/Drupal/Core/Render/Renderer.php on line 448

Have no clue how to fix this.:

The requested URL /admin/appearance was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

I did a clean install of Drupal 8.4.0 and have searched the internet now for about a day and found no fix for this problem. No matter what link you click I get an error. I have checked with my server company and they wanted me to ditch everything and start over with a version of 7.

Hello everybody
I am new on drupal 8. I will want to display data from an external database called ma-base. I use the view database connector module.
I made my configuration on setting.php as follows.

Hi,

"Awesome" new Drupal 8 site is tanking on Google Page Insights. :^) [both mobile and desktop under 50/100 - ouch]

I'm getting the image compression under control now that I have a decent understanding of what image sizes need to go where.

But there are a dozen+ other factors that come into play.

Most point at minifying javascripts/css/html.

I am currently running PHP 5.6.29 but am scheduled to upgrade that in the next 30 days.

Hey there,

I want to show on each page a different image in my header. How can I do that?

I already found several solutions, but nothing that worked for me. I want them to be in an independent region (ideally in the header under the navigation, outside of content).

It's driving me crazy. I've worked with a lot of other systems than Drupal before but cant find a good solution...