My task for processing was to experiment with codes to create different shapes using codes such as rect(80,20,120,140);. That code creates a basic rectangle to write code you need type in between (x,y,w,h) and always ends with ; semicolon. Before you process you need canvas size by doing this you type the in code size(800,400);.
To creates circles you use the word ellipse in the code such as ellipse(320,-200,400,400);. To fill shapes in colour you type before you enter the shapes code for example
fill(250,0,100); the three digits in between the brackets stand for RGB
ellipse(320,-200,400,400);