Thresh:
Thresh is really squishy in the early game, when you have a shot at him hook him right away. If he hooks you, wait for him to use his E and then E away.
Blitzcrank:
It isn't that good of an idea to hook Blitz, always aim for the adc. If he hooks you wait for him to use his E, similar to Thresh.
Nautilus:
Check the Threats chapter.

Those guys are easy kills early on. If they ever poke you retreat out of vision to regenerate your health. Always look for hooks.

Once you get your mobis+dirk you should start roaming to mid. Try to scan the area with Control Wards and your Oracles. In lane, put your control wards in the lane bushes, so you can get better positions for hooks. Scan the map with your W and clear out vision.

Keep clearing and putting down wards, vision is a powerful weapon. Always look for hooks, but don't hook the 10/1 Darius into your team. Your job in Teamfights is to ult. Don't go for the 5 man stun with your E, you're just going to get killed. Hook any potential threats away from your ADC. Float around in W and wait for the right moment to Ult.

E+Flash:
You can change the direction of your E by using flash after you have used your E, in order to hit multiple targets or if you missed it/ the enemy dodged it. Always try to do it the very last moment so they don't have any time to react.

E+R:
You can curve your E with your flash jut like e you can do it with your flash. Pyke always ends up in the center of the X if you hit an enemy, so use your E, Ult so the center is behind the target, and boom- they're stunned. You can also use that as a teamfight engage, but only do it if your team has no other engage whatsoever, since you're going to get killed instantly.

Q+Flash:
You can flash while charging up your Q in order to extend your range.

Q+R:
If you see a low health target, but not low enough for execute, use your Q, and ult where they'd end up after the hook right after it hits. This way, you cancel your animation and give them no time to react.