Once you've learned the basic sequence of play in a poker game, there are a few things you should commit to memory as fast as possible. The team at WPT Global, have you covered with a breakdown of the first three things you need to study when learning to play Texas hold'em poker from scratch.
When you first set out to learn the game, it is well worth starting out at low stakes (or even on play money tables). This gives you room to make mistakes without burning through your bankroll. And you will make mistakes to start with.