If you want to learn to create relatively simple online games using Javascript, then the HTML5 Game From Scratch Step By Step Learning JavaScript course is a great place to start.

BlockLike.js is an educational JavaScript library that attempts to extend the block-based Scratch learning experience to JavaScript text-based programming.

You will get access to over 1,000 lessons that you can learn from at your own pace, and each lesson is taught by an expert like Tony Staunton, a Python development and productivity consultant.