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This WordPress Plugin add secure headers to you WordPress site.
The Following Headers are included: 
– Strict-Transport-Security: Enforces SSL if your website is using SSL (which it should be) 
– X-Frame-Options: Prevents Clickjacking 
– X-XSS-Protection: Prevents XSS attacks 
– X-Content-Type-Options: set to ‘nosniff to prevent MIME-type sniffing 
– Referrer-Policy: set to ‘no-referrer-when-downgrade’
<ul>
<li>No setup required!</li>
</ul>

WP Secure HTTP Headers

License: GPLv2 or later WordPress plugin to add secure headers to your website.

This WordPress Plugin removes authors from the Yoast SEO Sitemap.
<ul>
<li>No setup required!</li>
</ul>

WP Remove Authors Sitemap from Yoast SEO

License: GPLv2 or later WordPress plugin to remove authors from the Yoast SEO Sitemap

WP Secure HTTP Headers vs WP Remove Authors Sitemap from Yoast SEO