Trouble editing nodes on a Bezier shape

[Falsedog]

Basic stuff but here I am trying out ways to correct my mistakes when plotting out a Bezier curve / line shape. When I make a mis-step in drawing the shape, I've been finishing the shape early, then going to in to Edit mode and removing the last node. I then have trouble continuing with the shape.

Ideally there is a back-step command or button I don't know about. At the moment I'm deleting the entire thing and starting again but I'm sure there's a regular way of going back a step and continuing?

Thank you.