How to add external/internal file into Drupal 8 theme
This page explains how to add a style sheet or javascript file in to drupal8 theme.
How to render block in Drupal 8 theme template.
Drupal's theme system allows a theme to have nearly complete control over the appearance of the site, which includes both the markup and the CSS used to style the markup. For this system to work, modules, instead of writing HTML markup directly, need to return "render arrays", which are structured hierarchical arrays that include the [...]