Hi, and welcome to Cardschat. I'm sure some people will be able to give you some more direction on how to best tackle this game as a beginner, but to at least begin to answer your question in simple terms, a big problem with those hands, is that you are often up against a hand that has you dominated. Meaning, with your A10 hand, you may be feeling pretty good with an Ace on the board with your second card (your kicker) being a decently high card as a 10, but it is vulnerable to similarly higher unpaired hands AK, AQ, and AJ. In the same way, with KJ, if you have paired your K, you are vulnerable to AK, QK. And if you have paired your J with your KJ, you are vulnerable to AJ. Also, along that line, you need to be careful with your favorite hand of AQ, as you will be vulnerable to AK. Again, I'm sure some people will be able to give you better answers and direction, but that's a start. Also, as far as being aggressive, that sort of applies to your entire game of poker. The overwhelming consensus for playing poker is you are better off playing aggressive versus passive. Good luck on your poker journey!