hi, yes , you are very welcome here…
but at first i ask you to forget all the tools, the code , the videos
it is UP TO YOU what you want to LEARN to DO.
basically you tell me if:
want learn to make code for a good graphic show
in a browser / online / so friends can see it ( with a link provided )
YOU must learn p5.js / write a sketch.js file / best online here
( and make a account there )
OR
learn JAVA used in a stand alone desktop app on your PC
best using processing 3.5.3 IDE and writing mysketch.pde files
but also it is true that in both cases the CODE you can write by any editor,
we can not teach all in one question,
so as a beginner i urge you to use
JAVA >> processing IDE 3.5.3
JS >> p5.js online editor
JAVA and JS, that are 2 different languages
but the prepared functionality for processing
makes it actually easy to work with both / even not all can be translated…
but i can not tell you how much confusing it might be to explore both in the beginning
might be better you try like
++ one month JAVA
++ one month JS
even the teaching videos ( and the mostly also provided code)
are helping for a fast learning curve,
( also all the provided examples / tutorials… )
you must start alone with a empty sketch
and make just a line!
JAVA _ line() / Reference / Processing.org
JS ___ reference | p5.js
just to prove that you are in the right ( and correct installed ) environment
and use the correct language syntax.