Disable Caching Drupal 8

1. Copy and rename the sites/example.settings.local.php to sites/default/settings.local.php:

$ cp sites/example.settings.local.php sites/default/settings.local.php

2. Open settings.php file in sites/default and uncomment these lines:

if (file_exists($app_root . '/' . $site_path . '/settings.local.php')) {   
  include $app_root . '/' . $site_path . '/settings.local.php';
}

which used to be in previous D8 versions:

if (file_exists(__DIR__ . '/settings.local.php')) {
  include __DIR__ . '/settings.local.php';
}

This will include the local settings file as part of Drupal's settings file.

3. Open settings.local.php and uncomment (or add) this line to enable the null cache service:

$settings['container_yamls'][] = DRUPAL_ROOT . '/sites/development.services.yml';

By default development.services.yml contains the settings to disable Drupal caching:

services:
  cache.backend.null:
    class: Drupal\Core\Cache\NullBackendFactory

NOTE: Do not create development.services.yml, it exists under /sites

4. In settings.local.php change the following to be TRUE if you want to work with enabled css- and js-aggregation:

$config['system.performance']['css']['preprocess'] = FALSE;
$config['system.performance']['js']['preprocess'] = FALSE;

5. Uncomment these lines in settings.local.php to disable the render cache and disable dynamic page cache:

$settings['cache']['bins']['render'] = 'cache.backend.null';
$settings['cache']['bins']['dynamic_page_cache'] = 'cache.backend.null';

If you do not want to install test modules and themes, set the following to FALSE:

$settings['extension_discovery_scan_tests'] = TRUE;

6. Open development.services.yml in the sites folder and add the following block to disable the twig cache:

parameters:
  twig.config:
    debug: true
    auto_reload: true
    cache: false

NOTE: If the parameter block is already present in the yml file, append the twig.config block to it.

7. Afterwards you have to rebuild the Drupal cache otherwise your website will encounter an unexpected error on page reload. This can be done by with drush:

drush cr

or by visiting the following URL from your Drupal 8 website:

http://yoursite/core/rebuild.php

Now you should be able to develop in Drupal 8 without manual cache rebuilds on a regular basis.