Many shooters assume that crossdraw holsters are less safe, but in a skilled shooter, they can be just as safe as a standard strong side holster. You may have heard of something called the “crossdraw dance.” While this is not a holster setup that I would recommend for a new shooter, once you have been shooting for a while, you may want to try the setup to mix up your game.
Bear in mind that you need to be extra mindful of the 170 rule when drawing the crossdraw pistol in order to ensure that you are always pointed downrange with the muzzles. This setup does increase the risk of breaking that safety rule if you are not mindful of where you are. I would recommend practicing these skills a lot before attempting them in a match.
The following video will give you some good tips for how to use this effectively, and how to make sure that you are safe in the process. Once again, this is not a good holster setup for a new shooter.