By taking damage to give damage, he means like...
getting hit while you're in the air at low damage before you use your double jump and them immediately using your double jump to follow the opponent and hit back with your own aerial ( i think lol. Crouch canceling into down smash is good too. Not crouch teching, as that'll prly make you get hit again.) [V3ctorman can prly explain his thoughts on this better tho P: ]
...or by doing a DJCC... To do this, you have to be hit during your double jump. After you get hit, you can double jump cancel into an aerial of choice.
This means that you must try and use your jump right before you think the opponent is going to hit you with something. So you Jump > get hit> Aerial.
You can also use DJCCs to break out of combos. Just practice using your jump right after your hitstun ends. You can turn the combo back on the opponent like this lol. Just be careful at high damages, because instead of getting a free hit/combo, you might get gimped to death because an attack breaks your DJ at higher percentages. This means you gotta know which attacks break your DJ earlier than others, like FALCOs SHINE or marth tippers, lol.
As for yoshi's shield, One handy trick is to light shield to slide away from pressure lol. You can light shield, unknowingly to your opponent, in many ways. either use a trigger button if your good at that, or press and hold z while your in attack lag (like, during an L cancel). You can also Lcancel with z if that helps. Also, you can start holding z during any other attack on the ground (d tilt, d smash, etc)
