The Indy is usually the first grab you learn. Once your straight air feels balanced and predictable, the Indy is just adding a hand to it. While in the air, reach down with your back hand and grab the toe edge between your bindings. The key is bringing the board up to your hand by tucking your knees, not bending at the waist to reach down.
Most beginners bend at the waist, reach desperately for the board, miss, and land folded in half. Instead, think "tuck": pull your knees toward your chest so the board comes up to meet your hand. Your upper body stays relatively upright and balanced; your hand only needs to drop a small distance to meet the edge. This tuck-the-board-up instinct is the foundation of every grab you'll learn, so build it now.
Timing matters. Grab on the way up (right after the pop), hold through the peak of the arc, and release cleanly before the landing. A grab held too long becomes a crash because your hand is still on the board when you need it for balance. A good rule: by the time the ground is coming back up at you, your hand should already be back out for landing.
Learn more here:
Source: SnowboardProCamp · How to Do Your First Indy Grab on a Snowboard
Key tips
- Tuck your knees up. Don't bend over to reach the board
- Grab between the bindings on the toe edge.
- Grab on the way up, hold through the peak, release before landing
See a map of all grabs here.