Wordpress

First of all check for a corrupt .htaccess file on your FTP server. Rename the existing one and try to visit your site. If nothing changed the .htaccess is not the reason for the error. In my case the solution was to rename the folder "plugins" in the folder wp-content. Then try to access the website again if you see the text of your website of course without any graphical elements the reason for the error is a corrupted plugin. Now create a new folder "plugins" in the folder wp-content and move one plugin from the old plugins folder to the new created folder. After every movement try to reload the website if it is possible to see the content it wasn't the corrupted plugin. In my case an internal plugin of wordpress "wp_smtp_mail" was the reason for the error. Hope my solution helps! Good luck!

The best way to customize a WordPress theme, is to create a child theme. To do this, you need to create a directory in the themes folder, add a style.css and set the the ‘Template’ parameter in its header to the name of the parent theme:

/*
Theme Name: Some Child Theme
Template: some-parent-theme
*/


Then you need to create a functions.php file and make sure to enqueue the parents css:

add_action( 'wp_enqueue_scripts', 'mytheme_enqueue_styles' );
function mytheme_enqueue_styles() {
   wp_enqueue_style( 'parent-style', get_template_directory_uri() . '/style.css' );
}


After that, you can copy any template file from the parent theme to your child themes directory and change whatever you need. These files won’t be overwritten when the parent theme receives an update.