Spread Operators Courses
Pluralsight JavaScript Arrays Course (How To)
Treehouse Introducing ES2015 Course (How To)
Treehouse First Look: PHP 7.4
LinkedIn Learning What's New in PHP 7.4
Laracasts JavaScript ES6, ES7, ES8: Learn to Code on the Bleeding Edge (Full Course)
freeCodeCamp JavaScript Drag & Drop Sortable List Project
Traversy Media via YouTube ES6 and Beyond
egghead.io Learn ES6 (ECMAScript 2015)
egghead.io ES6 JavaScript Tutorial for Beginners - Getting Started
Academind via YouTube