No Limit Vs Limit Hands

From Poker Tips:

Types of Hands to Play

The types of hands you play in No-Limit differ than those in Limit. This is because of implied odds. Hands like KcQh go down in value because they cannot withstand much pressure. Even if you hit a K with this type of hand, you still may be losing to a set, two pair, AK, or may lose eventually to a draw. Thus, with big cards, you generally want to take down the pot at the flop. The exception to this is if you think you have someone outkicked (say AK vs. KJ with a K on the board), or if you hit the flop hard (like KK3 when you hold AK). In these cases, you generally want to extract money from your opponent bit by bit.

The types of hands that go up in value or ones that you can bet with confidence: pocket pairs and suited connectors (strong draws in general). Pocket pairs do well because they are sneaky and can often withhold pressure. With pocket pairs, you can bet hard if you have a set or an overpair, which are hands that people generally don't expect. Suited connectors go up in value for several reasons. First, if the flop comes weird, you generally will be paid off.

You: 7s6s
Opponent: AhKc
Flop: Ac7h6d

You'll get paid off a lot more on this flop than you would lose to the AK if the flop were Ac 7h 2c.

Furthermore, you can take down pots and disguise your hand with semi-bluffing.

You: 6s7s
Board: Js5h4c

People will probably put you on a Jack if you bet at this flop. They will then either fold or call. You'll either take down the pot at the flop, or you'll be drawing to a hand that people don't expect. If the final board is Js 5h 4c 8h As, and your opponent holds A J, expect a huge reward.