Use a Pinch Grip with the flat side facing away from you.
Alternate grip is "claw grip" with thumb one one side and index and middle fingers together on the other side.
Layover / Tilt
Vertical or slightly off vertical approximately 10° to 30°
Windy = 0° or perfectly vertical.
Light or No Wind = 10°-30° off vertical.
Right Handed = face into wind and turn right approximately 45 degrees.
Left Handed = face into wind and turn left approximately 45 degrees.
Throw Boom overhand and release slightly up from the horizon, approximately 10 degrees. Give boomerang lots of spin when released! (Think of cracking a whip or casting a fishing line!) Never throw a boomerang side arm!
As Boom curves around and flattens out and starts to hover, use hands in a horizontal clapping motion. Similar to catching a flying disc.
Remember not to catch Boom if it is coming in too fast or at eye level. Let it crash to the ground.