HSTS is HTTP Strict Transport Security, a means to enforce using SSL even if the user accesses the site through HTTP and not HTTPS.
More Plugins
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ACF Advanced Search
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Hide Element Shortcode
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Website Speed Optimization
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Safelayout Elegant Icons – WordPress icons
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AI Blog Automator
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Classic Image Button
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RSS ReadMore Link
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Alpha SMS
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SF Generate Tags
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Frontend Dashicons
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AdControl
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Darkify – Dark Mode & Night Mode for Website & Admin (Dark Theme Included)
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Show user name
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Remove WPML Menu Sync
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WHMCS Domain Checker
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Image Gallery Custom Post Type
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Hypotext
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Better Video & Playlist
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Easy Thumbnail Sizes
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Creative Tim's Rotating CSS Cards