Proper etiquette for joining a blackjack table involves several key considerations. First, observe the table and the ongoing game to understand the flow before participating. When you’re ready to join, wait for a suitable moment, usually during a shuffle or a break. Once seated, place your bet within the designated area and avoid touching the table until it's your turn to act. It's important to act clearly and decisively, using hand signals for actions like hitting or standing to avoid confusion.