learn the way the internet learned, first look at html. learn how the language works, then start "reading html and practice understanding it. then go for JS , then CSS. Here is a catchall of sorts where all 3 and more! are discussed:

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

i suggest find someplaces like this to retrieve some skeletons so you can see simplicity then learn to flesh it up, start small just make a page that says hello world, and displays a kitten pic , or some such thing:

https://linuxwebdevelopment.com/html5-boilerplate/

how you learn is important top down or bottum up. do you look at the big picture grand scheme and dissect it to find what parts make it up? or do you look at fundamental pieces, and examine how they relate to each other and function as a group?

here is a place to experiment with JS script so you can edit a snippet and see how things change:

https://jsfiddle.net/boilerplate/react-jsx/

keep in mind there are many flavours of java, but basically its a programme sitting inside the html.

CSS can be confusing to read if you have no context for it.

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

basically CSS is a way of enforcing a certain look or layout but there are some cool tricks that can do things like animations, or changing fonts formats and images according to some event in the browser.

frameworks come up, this is a not basic aspect