Even

Do I need to escape get_theme_mod('url') / ('mail') with esc_url?

Do I need to escape get_theme_mod('url') / ('mail') with esc_url?

Yes, you do. Even if you have sanitised the value when saving it, you should always escape on output.

Rest Is it good practice to use REST API in wp-admin plugin page? [closed]
Is it good practice to use REST API in wp-admin plugin page? [closed]
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Custom Custom column on CPT not showing correct value when meta data not set
Custom column on CPT not showing correct value when meta data not set
How do I display custom field values in WordPress? How do I enable custom fields in WordPress? How do I add a custom meta field to a custom post type?...
Posts Wordpress get recent posts, delete the current category
Wordpress get recent posts, delete the current category
You can remove recent posts,archives,categories on home-page with the theme customizer. go to Appearance -> Customize -> Widgets -> Sidebar –...