Acting "cool" is subjective and can vary depending on cultural and personal preferences.

Here are eight general habits that can contribute to a confident and composed demeanor:

Self-Confidence

Self-Confidence

Authenticity

Authenticity

Good Posture

Good Posture

Active Listening

Active Listening

Calm Demeanor

Calm Demeanor

Positive Attitude

Positive Attitude 

Respectful Communication

Respectful Communication

Kindness and Empathy

Kindness and Empathy