Guide:Expert Mode

Summary
"Fortune and Glory, kid" Expert Mode is pretty much a harder mode of the game. It offers harder enemies, slightly increased effects of debuffs, and unique boss loot. It is recommended to play the normal gamemode of the game before playing this gamemode because it is far more difficult.

The Beginning
Possibly you already know the basics (Get wood, break pots, and grab surface chests). It is pretty useful to use a ranged character for the beginning of the game since the enemies are far stronger and does a lot of damage when they touch you. Don't go exploring at night when you still have beginner gear because the zombies will be swarming you and kill you instantly.

Dig a hole straight down next to your base, (and dont forget to make a way up and a way down as well) until you find a large cave. Find minerals until you get stronger armor and weapons. And be sure to grab any chests you find.

Preparing for the Bosses
Bosses are harder in expert mode because they have 2x health and 2x damage, they have a third stage when normally they only have one, so be prepared.

At this point you would've had a few Heart Crystals and have 180 health, if you find another Heart Crystal don't consume it because if you do, it will trigger the 1 in 3 chance of spawning the Eye of Cthulhu while unprepared, so keep that one until you have gear like these: (This page is still incomplete and is been working on)
 * Gold or Platinum Armor
 * Musket or The Undertaker
 * Ice Blade or with some luck, Enchanted sword
 * Cloud in a bottle
 * Hermes boots or its counterparts
 * A very well-made arena will give you more chances to win