Problem regarding Additional CSSs

1.How to optimize CSSs that are in Additional CSS section of My child theme.
2. Is there any plugin to combine them ?

Hi Deepak,

Thank you for your question.

Do you mean in the style.css file of your child theme or in the customizer Additional CSS section provided by WordPress?

Kind Regards,

customizer Additional CSS section . And about which “CSSs” the performance checker refers to for minimizing

Just minify the CSS from that section using this site and then add it again in the Additional CSS section.