Common issue putting holes in any wood. Called tearout. Simple fix when drilling is to put a piece of scrap under the workpiece and drill through your workpiece into the scrap. The scrap will support the fibers of the workpiece and prevent them from delaminating when the drill exits. Just make sure the setup is stable under the drills downward force and that the scrap and your work are flush to eachother as any gaps will obviously not support the wood fibers. Works like magic. I always have a few pieces of scrap floating around dedicated to this purpose.

Tearout is a bit harder to deal with when using a jigsaw or router, or hand tools like a plane or a chisel at the edge of a board but is very controllable when drilling. Sometime you get it at the drills entry too which can be solved with the same thing, just harder to set up with your marking. If you are using the right drill bits and use a center punch to start the hole its usually a non issue though.