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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Increase Maximum Upload file Size Limit
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Private Post Share
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Primal for WordPress
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Shortcode for OpenTable Widget
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Image Focus Point
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Expandable Banners
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Word Balloon
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Sirvoy Booking Engine
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Easy File Upload & Approval – A Simple File Submission & Review System
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Bootstrap modal popup
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Headless Mode
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Grouped Comments Widget
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Next Page, Not Next Post
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Ni WooCommerce Payment Gateway Charges
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atec 404 Tracker
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Easy Scheduled Posts
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Auto Republish & Permalink Manager
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DK White Label
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Home Page Slideshow
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Debloat for WooCommerce