What are the winning hands in Texas Hold'em, and how do they rank in order of strength?

In Texas Hold'em, the winning hands are ranked in the following order of strength:

1. Royal Flush
2. Straight Flush
3. Four of a Kind
4. Full House
5. Flush
6. Straight
7. Three of a Kind
8. Two Pair
9. One Pair
10. High Card

These hands are determined by the combination of five cards a player holds, with the highest-ranking hand being the Royal Flush and the lowest-ranking hand being the High Card.