Front End Best practices Following are the links which explains the best practices to write more maintainable, scalabale and optimized code. https://cssguidelin.es/ https://sass-guidelin.es/ https://benfrain.com/the-ten-commandments-of-sane-style-sheets/ https://www.drupal.org/docs/develop/standards/css/css-architecture-for-drupal-8 https://css-tricks.com/bem-101/ https://www.sitepoint.com/bem-smacss-advice-from-developers/ http://smacss.com/