Assuming you don't have a fishing rod holder, and you're carrying the pole by hand, here are a few tips:
-If you're using a baitcasting reel, hold the rod in your dominant hand with your thumb on top of the spool. Rest the butt of the rod on your hip.
-If you're using a spinning reel, hold the rod in your dominant hand and let the handle dangle down. Again, rest the butt of the rod on your hip.
-You can also carry the fishing pole over one shoulder like a rifle. This is especially convenient if you're wading in water because you'll have both hands free. Just be careful not to snag your line on anything!