[minnesota_bound]

I only saw 2 rockets landing. Where is the 3rd one?

[afterhoursarmory]

Th video loops to the next video of the landing on the barge at sea.

[NorthMountain]

Side boosters really don’t go very far; they turn around and land back at Canaveral. Center booster goes farther, faster, and rather than turning around it lands on a ship at sea. The way Falcon Heavy works, we’ll never see all three landing simultaneously.

[plsvn]

I only saw 2 rockets landing. Where is the 3rd one?

The center booster landed on their barge in the Atlantic. The side boosters are what you saw landing back in Florida.

The center booster traveled farther and had a faster velocity than the side booster so the central booster wasn't able to return to Florida.

[csvset]

This video shows the landing and explains why a at sea landing capability is needed.

SpaceX lands rocket at sea, makes history