Is there anything I should know before starting Hollow Knight?
I bought the game on a whim for the switch, but I feel ill prepared. I don't usually play heavy action games like this and I hear it's especially hard for what it is. But I want to try.
Oh man you're in for a treat! One suggestion: when you get to the late game, if you haven't and can, switch to a controller, late game can be difficult, much more so if you seek optional areas, those can be crazy hard and plain impossible on a keyboard.
And prepare for feels. It's surprising how invested you can become on a bunch of bugs.
I second the controller, and that it's a good idea to learn to use directional pad rather than joystick, because precise movement is going to matter a lot in the late game.
I anti-second the controller - there's no benefit to it, and as the other commenter said, you're going to want to play with the d-pad anyway. Play with whatever you feel more comfortable with, there's no difference between the two.