Reply To: Need help with typography

Hello,

For the product short description, Navigate to Theme Settings > Typography > Advanced > Choose the custom selector and use this class.

.woocommerce-product-details__short-description

Screenshot for clarification:
https://ibb.co/HHkBsxF

And for the blog post use this class.
body.single-post p

https://ibb.co/ZczWGxY

Best Regards.