Disable account registration by anonymous users

If you don't need the functionality, that anonymous users can register, we strongly recommend to disable it. Thus you can avoid masses of unwanted requests.
Album One
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The "best" Social Media modules

Recommended Drupal Social Media modules (Easy to configure, easy to handle, flexible and reliable).
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Drupal 8: Mismatched entity and/or field definitions

If you get "Entity/field definitions Mismatch detected Mismatched entity and/or field definitions." you have to fix this issue before running updates.
Use the Drupal module File Entity (fieldable files) to add files over the web interface with Drupal 7

File Entity is an easy solution allowing you to add files over the web interface without FTP (if admin/content/file is missing, install File Entity module.
How to change the language attribute href (html lang="xx") without extra installations

Sometimes it is convenient to change the language definition of a website without the installation/configuration of extra modules/languages.
How to add a custom html.html.twig to your Drupal 8 theme

How to create a custom html twig file (html.html.twig) in Drupal 8. Useful to set the language tag (html lang="en") manually.
"The website encountered an unexpected error. Please try again later." (Drupal 8)
"The website encountered an unexpected error. Please try again later." Drupal 8 after the installation/uninstallation of a module, when you login or in general.
Meta Tags in Drupal 8: Special elements beyond nodes/taxonomies/views

In Drupal 8 the module Meta Tag covers the standard cases. The best solution for special elements such as path-based meta tags is the module Context Metadata.