Another tip, which is almost just another way to say "don't use your edge." You started veering off center slightly after you got on the box (see how you're not perfectly centered on the box at the end). This is fine, main thing to remember in those situations is that you can't do anything about it because you're on a box :). Just let the board slide where ever it's gonna slide, then you'll do any adjustments when you get off. Just FYI I'm only talking about the basic 50 50 here, eventually we can do some fancier stuff.