attack-on-ackerman:

1. fight rly hard

2. get the shit beat out of u and fall on the ground

3. get up slowly with blood dripping from ur mouth

4. crack a smile and say something about friends and not giving up

5. win. thats it u will automatically win after following steps 1-4

Also sometimes sit and watch the person you care about being beaten up/killed.  Then either:

1.  Win the fight right then and there

2.  Train really hard for vengeance

Warning:  Step #2 does NOT have a 100% success rate.  Training really hard takes years and years and years and there’s no guarantee your opponent(s) hasn’t/haven’t become even more powerful along the way (i.e. Attack on Titan).  There’s also a chance that you’ll discover that your opponent isn’t actually an asshole (i.e. Uchiha Itachi), so its recommended that, if possible, do step #1. Unless if its the first episode, then you really have no other choice but to follow step #2.