Autoptimize quickly optimizes your website for faster page load times. It can aggregate, minify and cache scripts and styles, injects CSS in the page head by default but can also inline critical CSS and defer the aggregated full CSS, moves and defers scripts to the footer and minifies HTML.
WP Super Cache Plugin is a caching plugin for WordPress. This plugin generates static html files from your dynamic WordPress blog. After a html file is generated your webserver will serve that file instead of processing the comparatively heavier and more expensive WordPress PHP scripts.
WebP Express is a WordPress plugin that uses the WebP Convert library to convert PNG, JPEG, and GIF images to webp. It allows you to convert images using multiple methods such as imagick, cwebp, vips, gd.