Any two cards can win

Any two cards can win. The first secret to winning texas hold'em, therefore, is to learn which hands have positive expected valuethi is a skill called hand selection

Poker hands percentages: David Sklansky and Mason Malmuth assigned each hand to a group, and proposed all hands in the group could normally be played similarly. Stronger starting hands are identified by a lower number. Hands without a number are the weakest starting hands. As a general rule, books on Texas hold'em present hand strengths on the assumption of a nine or ten person table. Sklansky's Groups Adjusted:

Tier Hands
1 AA, KK, QQ, JJ, AKs
2 AK, AQs, AJs, KQs, TT
3 ATs, KJs, AQ, 99, QJs, KTs
4 88, QTs, A9s, AJ, JTs, KQ, A8s, AT
5 K9s, A7s, KJ, A5s, Q9s, T9s
6 77, J9s, A6s, QJ, A4s, KT
7 QT, A3s, K8s, JT, A2s, Q8s
8 T8s, K7s, 98s, 66, J8s
9 A9, K6s, K5s, A8