Sucker Punch studio aims to offer intense, dirty and visceral fights. If your are familiar with Action-RPGs, you should find combat elements similar to Assassin's Creed or Sekiro, for example.
In Ghost of Tsushima, you'll have the freedom to fight as you wish, like a noble samurai engaging in duels, or rather like a ninja, killing sneakily from the dark, but you'll also be able to face hordes of opponents.
Here's a guide to help you grasp the different sides of Ghost of Tsushima's combat system.
Note that this guide will be edited and completed when Ghost of Tsushima is released on PS4 on July 17, 2020.