Step 3. Shapes & Drawing
By now you should get the idea. Daniel Shiffman is coding in the p5.js Web Editor.
We can run the World on Ancient Brain by clicking on the World image.
We can then "Clone and Edit" to make our own copy. You can follow all his coding and try it yourself in the editor on Ancient Brain.
In this video, among other things, he introduces the P5 documentation.
The Ancient Brain editor has "Intelligent Code Help".
Select a word and press "Code Help"
and it takes you to the P5 help page for the word you selected. Try it out!