I am a flash guy. I used to do BitmapData fun (wonderfl) which was offly related to “processing”. How can I enter webgl?

Webgl and “shadertoy” is why I am in computing, I am not here for Angular but this is how I make money.

My fascination is pointless processing of pixels and without it I feel bored.

I need to learn webgl but there seems no definite guide.