Attacking
You have two hand slots available in your equipment screen. They correspond to your main hand and offhand weapons. Try to equip them to keep your damage per second as high as possible. You can also equip the same weapon in both your main hand and offhand. This change your attack animation and may not increase your damage. Check your weapons and always slot the most powerful ones.
Avoiding damage
The small looped arrow near the attack button allows you to dodge. When you dodge, your character quickly rolls in the direction they are facing. Use it to avoid damage. It has a short cooldown and can be utilized often. This is especially important when facing Bosses that have area of effect attacks. An orange glow reveals where the attack will land.
Scoring
Earning a three star rank for a dungeon requires a very high score. To do this, build a large combo. When you kill an enemy, a score multiplier will appear at the top. A blue bar will appear below it and begin to drop. Kill another enemy before the blue bar disappears to increase your combo multiplier by one. This will score your next kill with extra points. Continue attacking and when an area has been cleared out, immediately move to the next one.
Skulls
Skulls are the game's premium currency. Complete the five daily quests to get skulls as a reward. Skulls can be used to purchase inventory upgrades, premium items, and other helpful things.
Talent trees
Choose a class to play and stay with it. Within that class, focus on a single talent tree. There are three talent trees, each that are tailored for one of the three different classes. For example, if you will be play as the warrior exclusively, concentrate on the path of power.
Various General Tips
There are only three classes in the game so learn their pros and cons to find the right balance of monster-slaying power and finesse.
Try out a mixture of different skill combinations with different hero classes and weapons to find the build that best suits your play strategies.
You can always switch out your skills inside dungeons as long as you aren't in the middle of a fight.
Dual wield melee or powerful two-handed weapons have a chance to stun and push back enemies from a range. A handy one when you're trapped in a zombie horde.
The easiest way to compare weapons and armor is to look at their item level. The higher item level means better item.
The dodge roll is an excellent move to get out of trouble quickly.
Always try to take out ranged enemies first and deal with the melee enemies afterwards.
Always break those barrels as they hold riches you might need: gold, crafting materials or even health and mana potions.
Attacking...