Deciding what kit to use

Currently there are 3 kits: Warrior, Hunter and Alchemist. I will be going over each kit separately in detail, to help you decide which one would best suit you and your playstyle.

Warrior

While using the Warrior exclusive item: Playing Cards, on average 1/4 hits on a mob will heal half a heart. Due to this, healing is a lot easier and you don't have to worry about scarce healing potions.

Hunter

Hunter's passive ability let's you hide in grass and ferns, enabling you to get a free hit. If you shoot a mob while holding the Hunter exclusive item: Poisonous Pufferfish you inflict them with Wither 1 for 0:10. There is another Hunter exclusive item which you get from the kit: Leather Quiver, you get Strength 1 for 0:05 after a kill, this isn't very useful against a boss though.

Alchemist

The Alchemist kit has Mining Fatigue 3 and can't use bows, however, healing is plentiful since you can brew potions quite easily. Flask o' Disintegration Curses and the Alchemist exclusive item: Flammable Rags are a good combination to deal damage giving the Wither 1 effect for 0:05 and setting them ablaze for a short period of time.