Drupal 8.x

Hello Community,

Hi Everyone,

in Drupal, some dynamic content can be achieved either by cache or lazy builder, 
can some one help to make it clear, in what situations, to apply one of the two means?

thanks.

from time to time, we can see snippet using #cache key, say

  '#cache' => array(
    'keys' => ['ascii-art', 'llama'],
    'tags' => ['node','node_list'],
    'context' => ['session','user.permission'],
    'max-age' => 3600,
  ),

can some one help us to make it clear, when caching, which one [keys, tags, context, max-age] do the drupal core to respect and handle?
is there any conflict or privilege among them?

thanks very much.

I'm messing around with drupal's deploy module and trying to configure it under drupal 8. I've just watched video about drupal 7's deploy module and i would be interested to access under drupal 8 such panel as you can see on this screenshot (taken from video "Intro to Content Deployment in Drupal 7"):

https://ibb.co/cJ6gXJ

So far i have checked many configuration options in drupal 8 and do not seem to find anything like this.

this is going to be quick and direct. I'm trying to access different content results from a view related with a content type. I'm pretty much a newbie with twig, but I did make it work to access fields.

Example: Content Type: Books Fields: Name, Portrait(Image). Machine Name: field_name - field_image

Let's say I upload 2 contents called Book 1 and Book 2 based on the content type.

What I want is to display all fields from Book 1 for the moment or Book 2 but not all of the content at the same time.

My effort:

-First attempt: tried this line of code: