I don't know what to use for my directional dash system?

[Quadlely]

For my dash system I was going to use body velocity but is there any other way’s

[Hazania]

ApplyImpulse is a simple and clean method to do this.

[magEri_n (erin)]

Linear velocity on Line mode, set the max force to like 30000. (Actually you might want to make it higher since I see some issues coming up now when you use it at first)
(Create it on the client though, I’ve seen linear velocity on the server somewhat make the player teleport on other player’s screens.)

[Hazania]

@magEri_n

Create it on the client though, I’ve seen linear velocity on the server somewhat make the player teleport on other player’s screens.

Always do character movement on the player’s client. Character movement is always handled on the client for this exact reason. All character movement is replicated automatically to the server and to all other clients.