Well, to answer your question, this means fold any hand that has a card lower than a ten in it (yes, that means fold ace 9). But, if you ask me, this is horrible advice. This is what is known as playing way too tight. As soon as your opponents realize what youre doing(and it wont take long), they will basically know when you have a hand and when you dont. Thats bad.
Instead, try to become comfortable playing a wider range of hands when you can afford it and when your position at the table warrants it. For example, fold that ace 9 when your under the gun(first to act before the flop), but try raising with it when youre on the button and the action is folded to you or others are trying to limp in(just call the big blind). For that matter, try raising with ANY HAND from that position. The point is to put pressure on your opponents when youre in a good position to do so. Once you become comfortable playing a wider range of hands and get a feel for your opponents, youll be more successful.
One other thing to be aware of. You need to know when to fold those ace kings and pocket jacks. Just because it was good before the flop, doesnt mean its good after the flop. Be aware of what your opponent may have and and act/ react accordingly.