Illustrator - tutorials

As a starter activity i started by looking at some tutorial videos of illustrator, as i am confident with this software i knew the basics so i looked at using the pencil tool as i never use it that much.
They lookat at the short cuts of the pencil tool and how you also have a smooth pencil tool, i learnt that you can draw on top of your stroke of another line that was drew with the pencil tool and that will change the path instead of on top of it, you can also change the shape by selecting the white arrow and moving the anchors to change the shape.
https://www.youtube.com/watch?v=mApJiURbBAg&feature=youtu.be - Link to the video.