Against fizz, Fizz has good kill pressure at level 3 and 4. Respect his all-in and try to poke him down before he gets the chance to play aggressive. 

Fizz's Playful / Trickster E allows him to dodge damage and escape from trades. Do not go for all-ins unless he has already used this ability beforehand so you’re guaranteed to hit your abilities on him.

Keep an eye on your XP bar between levels 5 and 6. If you think Fizz is going to hit level 6 first, try to stay at max distance and play safer. When Fizz hits level 6, his kill pressure intensifies and he can easily kill you if you’re level 5 and are overextended. Against fizz, Fizz has a good pressure to kill on level 3 and 4. Respect his all-in and try to make him fall before he has the chance to play aggressive. Fizz's Playful / Trickster E allows him to avoid damage and escape from the trades. Do not go for all-in unless he has already used this ability in advance so that you are guaranteed to hit your abilities on him. Keep an eye on your XP bar between levels 5 and 6. If you think Fizz will hit level 6 first, try to stay at maximum distance and play safer.