Trump has ONE strategy for tonight; Hillary is ready for multiple contingencies
Trump can't focus, can't learn, can't prep. He had no plan for the first debate. His handlers are hoping, HOPING that he can have one plan for tonight and stick to it.
Lots of problems with that, chief among them being that they can't control the questions he will be asked. He's like the tourist who plans on visiting France and learns how to ask a few questions in French but doesn't have the capacity to understand the answers that those questions will elicit.
Hillary - on the other hand - is ready to handle multiple scenarios as they develop in real time. Fact is, she has done so many townhalls and debates that she doesn't even have to do any prep. But being smart, she prepped like crazy, doing the hard work in advance of the event so that everything will look natural and effortless during the debate.
All that need happen is for the audience or the moderators to ask a question that moves Trump off the script he will cling to by the thinnest of threads. If they can't or won't move him off, the it will be Hillary who will pull another Machado moment out of her bag of surprises to disarm and destroy the man who would be Groper-in-chief.