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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All Embed – Multi-Source Embed Widgets for Elementor
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Liane Form
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Categories For Gravity Forms
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Subscriptions for WooCommerce by Sublium
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PHPINFO Print
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CLUEVO LMS Extension: Video Tutorial Manager for YouTube (and other oEmbed providers)
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GP Additional Links
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User Toolkit
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WP Nav Menu Cache
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Yappa Widget
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Max Upload File Size Manager
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Comment Guardian – Remove Comment Spam by Language Detection
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Simple Accessible Spoilers
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Profile Update Notification
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BrightEdge Autopilot
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Generic Stats
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WP-Socialight
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Students Count for LearnDash
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MY SMTP WP
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There Can Be Only One