JavaScript online courses:

https://developer.mozilla.org/en-US/docs/Learn/JavaScript

https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/basic-javascript/"

https://learnjavascript.online/app.html

https://javascript.info/

https://www.learn-js.org

https://eloquentjavascript.net/

JavaScript Videos:

https://code.tutsplus.com/categories/javascript/courses

https://docs.microsoft.com/en-us/shows/beginners-series-to-javascript

https://www.youtube.com/watch?v=PkZNo7MFNFg

JavaScript Tools:

https://developer.mozilla.org/en-US

HTML CSS online courses:

https://csslayout.io/

https://www.awwwards.com/sites/zero-impact"

https://htmlcheatsheet.com/css/"

https://learnlayout.com/

https://web.dev/learn/css/

https://www.w3schools.com/howto/

https://codemyui.com/tag/pure-css/

CSS animations:

animate.style/

https://animxyz.com/

https://animista.net/play/

https://ianlunn.github.io/Hover/

https://www.minimamente.com/project/magic/

Games for learning CSS:

https://cssgridgarden.com/

https://flukeout.github.io/

http://www.flexboxdefense.com/

https://flexboxfroggy.com/<br>

CSS Tools:

https://caniuse.com - check for browser supported features

CSS Flex: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout/Basic_Concepts_of_Flexbox<br>

https://developer.mozilla.org/en-US/docs/Web/CSS/flex

https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout/

https://css-tricks.com/snippets/css/a-guide-to-flexbox/

https://www.w3.org/TR/css-flexbox-1/

https://github.com/philipwalton/flexbugs