Reference documentation and lots of examples are available directly on the [website](http://p5js.org/).
Ranked in these QuestionsQuestion Ranking
Pro Very simple
It's one of the easiest drawing libraries to learn.
Pro Works with all of the common browsers
That includes: Chrome, Safari, Opera, Firefox and IE 10+
Pro Pretty lightweight
Pro Accessible documentation
Reference documentation and lots of examples are available directly on the website.
Pro Great community
p5 users benefit from the Processing community's 15+ years of growth and discovery. Processing code can easily be converted to p5.
Pro General Programming Concepts
As a continuation of the Processing project, this frameworks helps in understanding the general programming concepts that goes beyond drawing (connecting electronics, using sounds or the webcam etc),
Pro Easiest to learn to obtain high grade results
In a few days any body can understand extremely complex figures in a few minutes.
Pro A lot of YouTube tutorials
Con No built-in rendering
If looking for something to build UIs with or similar, one might be disappointed by the lack of any pre-defined UI element objects and such in p5.js. One has to write all the rendering code for any objects one includes, integrating it appropriately with the loop.