crazy, I thought there were a tonne of threads out here on this topic, but when I searched "southpaw", "south paw" and "left handed", not a whole lot came up. -fundamental skills are all the same; hands up, head down; proper footwork, don't cross your legs; learn your proper range; always move something: hands, head or feet. -southpaw vs orthodox -most of the time is spent moving to your (SP) right, placing your lead foot on the outside of their lead foot -when you are in that outside position throw a lot of lead straight lefts, down the middle, with your head shifting to the right. this is super effective counter against their orthodox jab (where your countering hand is on the inside of their jab and your head is on the outside) -finish your combinations with your lead hand (hooks or jabs) often. it is the closest hand to them, it puts you back in self-position/stance, and supports you in moving to the right -if they are better at keeping outside position than you (their lead left foot on the outside of your lead right foot) then watch out for their rear straight right to your head, slip to the outside (your left) and come back with your straight left (once you start landing that and getting better with your range put it in a combination like straight left-right hook-straight left, then escape to your left) and after you learn that, remind yourself that these are not secrets. most experienced boxers know this stuff so they will try to do the same strategies against you. the difference is that 90% of your work will be against orthodox and 10% of their work will be against southpaws. Majority of the time you should have the upper hand due to sheer experience. good luck!