I know how to setup it up, but if I for example, want to model a car, I will use planes and model it with a reference image on the back. But then, from time to time, I switch off that view, and I realise what everything I was doing, is looking at the wrong way, and the planes extrude inwards except upwards... What am i missing? should I hold something when extruding? Or is there anything I should know? Maybe it's too advenced for someone who started recently but I would really like to learn how to design like that.
Feel free to share any tips