A tip for any Fringe-goer, audience and actor alike: go and see as much as you can! Make use of the half-price stall, two-for ones and, of course, your passes (if you have one). Just because a show is free or cheap does definitely not mean it's bad!
If you have a chance to socialize too, take it! Meeting and talking to different the members of different companies can teach you very much about the theatrical world. There's always a little more inspiration to be had and a few more connections to be made, and meeting people and seeing their shows is a fantastic way to achieve this.
Whether you're here for a weekend or the whole month, don't turn down a flyer on principle, don't miss out on events and do, by all means, try to squeeze in as much as you can! Leaving the Fringe wishing you had seen that one show or talked to that one actor sounds very depressing, especially as it will be completely different next year!