At home dry fire
What is dry fire ? Dry fire is practicing with your firearm with no live ammunition present. Dry fire is one the most cost effective way to practice, one of the most time efficient ways to practice, 15 minutes is a good amount of time to practice. Dry fire practice is relatively safe as there should be no live ammo in the room, where your are practicing, also, make sure the backstop can stop a bullet (just in case) and is pointing towards a wall that leads to the exterior of your home.
Check the manual for your firearm to make sure its safe and will not cause damage to your firearm if you use it for dry firing.
In the event you are not comfortable using your firearm there's a training tool called the SIRT (Shot Indicating Resetting Trigger) by Next Level Training and if you use code EPP10 at check out you can save on the purchase of your very own SIRT Pistol.
Keep an eye out for dry practice drills.