I know most of the folks here are experienced gun handlers and this is old news to the majority of you, but for our newbies and as a reminder to everyone: if you drop your pistol let it fall. Almost every modern gun (and modern in this context goes back to before most of us were alive) is drop safe. What's not safe is catching it and your finger accidentally goes in the trigger guard, you close your fingers to grab, and pull the trigger. Make the conscious decision now to let it fall so you don't react instinctively.
The catalyst for this reminder is an older gun owner who managed to shoot through their own exterior wall and into the next door neighbor's bathroom. Don't be that guy or gal.