To improve poker game. One must know the basics of how to play poker game. Study poker strategies, different hands in poker, probabilities. Practice reading opponents.
I agree with everything you said. Reading your opponents and how they react but this is hard when you're playing poker online but when you do this offline and you're in front of each other, you'll have to do the art of reading their reactions and faces as it will help you decide.
Alot of patience and clamness. It involves both skills psychological and risk management.
Together with reading them, you have to be patient and calm so that's right as well. You'll need to be patient as you wait for how they move and as you observe them whether they're like a flip guy or a risk taker or just folds when they don't have a strong card.