Hecarim is a strong duelist in the early game and will try to solo kill you early on. Do not underestimate his early game damage as he will usually come out ahead.
Look at what Summoner Spells Hecarim has taken. If he’s taken Ignite, he will be looking to play ultra-aggressive early to get kills. If you’re low, do not try and trade with him as he will finish you off with Ignite.
Hecarim has good Dragon taking ability and can solo it early on thanks to his AOE heal from his W and short cooldown Q. Make sure you have vision on the Dragon at all times. If you can, try to take it away from him.
Do not group very close together as it will allow Hecarim to get a multi-person Ultimate R which will help him and his teammates win the fight.
Hecarim’s Ultimate R is roughly the same width as the paths inside the jungle. Try and avoid fighting in the jungle as it will allow him to get his Ultimate R off on your whole team.
Hecarim may try to flank in team fights so he can get on to the backline with his Ultimate R. Ward the flanks so you can spot him before he engages.
Hecarim spikes at level 6 as that allows him to unlock his Ultimate R which is a great duelling tool which will help him win team fights and 1v1’s.
He is a snowball heavy champion and can easily get ahead just from a kill or two. Try to not feed him or gift him kills as he can quickly snowball out of control.
When Hecarim completes Trinity Force, his duelling power intensifies. Avoid 1v1s with him unless you’re ahead.