Kerbal Space Program 101 - When Do You Start Your Gravity Turn?
This is a series of launches of the Kerbal-X first manuallly, then using mechjeb with different parameters, showing that starting your turn into orbit too early or too late will waste fuel. I've had a few people send me 'how to get to orbit' tutorials which have been stuffed with bad advice, so I made this to show how the differences.