A WordPress child theme is a theme that takes over functionality from another theme called the main theme. Child themes allow you to edit or add functionality to the main theme. A child theme is the safest and easiest way to modify an existing theme, whether you want to make small or very large changes. Instead of changing the theme files directly, you can create a child theme and use it to override the existing functionality.
How one creates a childtheme is explained at :
https://codex.wordpress.org/nl:Child_Thema's
Related Articles
WP_Widget in … has not been in use since version 4.3.0. Use instead:/ Notice: The called constructor method for WP_Widget is deprecated since version 4.3.0! - Download latest version of WordPress
- WordPress migrating to another server and/or setting up test environment
- High results Google PageSpeed Insight with a WordPress Theme
- Install wp-cli on your server / Update wordpress via Commandline