the playability of your cards determins how easy it will be to make a good decision postflop. Cards with good playability are AK, suited connectors (ex: 78s, JTs), pairs (ex:22,88, KK). Offsuit hands with big gaps have the worst playability.
for example, 66 is a hand with good playability, on a board like Ad6s2c u easely get your money in, on a board like AcJdQs 66 is an easy fold.
Ackd good playability, u dominate often on a board like AdTs5s but with Ac4d u may have top pair but can easily be dominated and u get in dificult spots
JsTs on AdQs9s u may be behind but u have a strong drow, on 5sKc8d easy fold

the idea is to be able to make easy decisions postflop as often as posible, offcours you'll be in though spots with cards with good playability too but not that often