I am a beginner. What are the rules of Texas Hold'em?

In Texas Hold'em, each player receives 2 hole cards, and 5 community cards are revealed in stages. Players make the best possible 5-card hand using any combination of their 2 hole cards and the 5 community cards.
The main stages of a hand are:

• Preflop
• Flop
• Turn
• River
• Showdown