Visual representation of frame trapping (arrows)

This is only theory. I don't have any real footage on how frame trapping. If anyone have better experience over it, please tell me if it works.

 Arrows can be effective to frame trap as they have a very low cooldown when tossed from the air (only 19 frames) while covering a very large area.

Here is the scenario : Pit Downthrow, read the airdodge and punish with Dair which pops the Marth up (airjump used : 1) : https://youtu.be/CDGmz8nme6s?t=30s
We will frame trap the option : Fast fall toward the stage to recover from below.

Pit airjumps and starts shooting his arrow.

We can see that he shoots the arrow up. Yes it seems logic to aim at where Marth currently is, but you should shoot to where Marth will be. And he willl get hit by upward arrows if he double jump toward she stage which wil put him in juggle state without his double jump.
In green, that is the area that an horizontal arrow can cover. If Marth fast falls diagonaly down, he will have to airdodge to not get hit.

Marth starts air dodging. During the lag of the arrow, fall toward she edge.

Pit is crouching : You can see that Pit's lag ends before Marth's airdodge.The green cross is where Pit would have been had he drifted out after tossing the arrow.

And here you go, Marth finish his Airdodge right in a convinient place for you to Airjump Dair.

To conclude, edge guarding is something can be pushed further than what Earth really does right now, but only from the lab. Go to your replays to see what you should have done better in each edge guarding situations.
In friendlies, feel free to  give up stage controle to try edge guarding. Even if it ends up missing, go for it and test your limits.

PS : one of the most basic ledge traps is an auto canceled up air on stage, if the opponent air dodges or pulls out a move that doesn't land successfully they'll be stuck in end lag and you can punish with another attack like up smash. If they don't do anything they'll have to eat the up air. Credits go to @Punished

PPS :
Here is an application in a friendly game :