Here is a good list.
https://github.com/kosmos/awesome-generative-art
Also… Shaders ! Is a great way to start.
Thats my work. All realtime.
I recently found the "Bridges Archive" online [1]. It's a goldmine of ideas (I won't link to them but they have tilings, space filling algorithms, multi-scale Truchet patterns and many more).
I favor the ideas rather than the implementation as I already know how to program so you may do better with learning something like processing/p5.js [2].
In terms of raw ideas, I've found Jared Tarbell to be a huge inspiration [3] [4].
I'm sure I'll get lashed on here for the mere mention of NFTs but I've found there are consistently awesome generative art being displayed on Twitter for artists showing their work and advertising their NFTs for sale. One resource that I've found to be pretty consistently good is fxhash.xyz [5] [6]. Looking for #fxhash tags on Twitter will probably give you rich results.
I also have my own NFTs whose source code I've released as CC0 if you want to take a look [7] (none are for sale right now) along with a half assed attempt at making a list of resources for generative art [8].
There's plenty of "awesome" generative art lists [9] as well as many examples and other projects on p5.js [2]. And of course there's always Reddit [10] [11].
Oh and "Coding Train" is deceptively deep, packing complex ideas in a kind of "cutesy" veneer but still managing to tackle topics that run the gamut of easy to incredibly difficult [12].
There's really too many resources to list. It depends on what level you're at. I tend to focus on Javascript and the 'ideas' rather than the implementation so much. If you're starting from a point of learning programming, you're probably better off going through a tutorial or two on how to actually program and then try and tackle some "classic" generative art examples (grids, recursive grides, flow fields, etc.).
I occasionally run into people who have all their experiments on GitHub which might be enlightening [13].
[0] https://tylerxhobbs.com/essays
[1] https://archive.bridgesmathart.org/#gsc.tab=0
[2] https://p5js.org/examples/
[3] http://www.complexification.net/gallery/
[6] https://twitter.com/fx_hash_
[7] https://github.com/abetusk/iao
[8] https://github.com/abetusk/iao/blob/main/Notes.md
[9] https://github.com/kosmos/awesome-generative-art
[10] https://www.reddit.com/r/generative
[11] https://www.reddit.com/r/proceduralgeneration/
[12] https://www.youtube.com/channel/UCvjgXvBlbQiydffZU7m1_aw
A collection of my generative artwork, mostly with Processing in Python mode https://github.com/aaronpenne/generative_art
cutterkom/generativeart: Create Generative Art with R https://github.com/cutterkom/generativeart
kosmos/awesome-generative-art: Awesome generative art https://github.com/kosmos/awesome-generative-art
Programming Graphics I: Introduction to Generative Art | Joshua Davis | Skillshare https://www.skillshare.com/classes/Programming-Graphics-I-In...
OpenFrameworks and Cinder are probably a bit more powerful, but more difficult to use (built around c++).
I also like PaperJS, which is built around JavaScript, but doesn't have the performance of Processing and OpenFrameworks.
Finally, you can just use raw drawing APIs (such as Canvas in the browser).
Good list of resources here: https://github.com/kosmos/awesome-generative-art