Just a couple of edgehogging techniques depending on location. I can describe it in relation to Final D's floor design. There is a diamond-like shape in the middle, and if you are at the corner of that, and hit forward b with no charge, you will grab the edge. Also, if you are on the second arrow (furthest from the edge), you can do an upb, make it go out off the stage and have the second one come back and a LITTLE bit downwards. If you don't do it enough, you will come back onto the stage. And if you do it too much, you will go below the stage and die. So if you wish to execute this in a match i suggest you practice it. A lot. The first one is easier but slower, while you can do it further from the edge. And of course, you can always renew your invincibility frames by tapping down from the edge and immediately doing an upb. Thanks.