I love to use https://editor.wickeditor.com to make animations.
The website is designed for beginner animations and games.
The site works best on a Windows 10 laptop or desktop (PC) with a screen size of 15.6" or larger.
I think the site is excellent as I can learn javascript (I think) by trying to make games using the reference part of the code editor (when you click on a type then a choice then it enters the code for me and I just have to enter a small amount.
I first heard about it from watching a youtube video by Alan Becker: