Druids are a very unique class.  They join Death Knights as the only class that doesn’t get a shield when tanking.  Druids can also heal, and DPS.  They have a wide rainbow of uses, because in cat form they can also stealth like a rogue.  When a druid is in a shape shift form, they are immune to polymorph.  If they get polymorph cast on them, they can simply shape shift out of it.
The moonkin form becomes available to Druids who specialize down the balance tree.  The moonkin is a popular form that allows a Druid to become much like a mage, except they receive 370% armour bonuses, which makes them very difficult to kill as well.  Additionally, they have a passive buff to allies that give 5% extra critical chance, 2% mana refunded on criticals, 3% spell haste and an additional 5% damage based off of your total spirit.
At level 30, Druids get a unique travel form that grants the ability to travel 40% faster while outdoors or in certain areas.
Dire bear form is the tanking form for a druid, and when shifting into it, you gain attack power, 370% armor contribution from cloth and leather armour, same as the moonkin form and you also gain 25% stamina.
There is also an aquatic form that allows swim speed to be boosted by 50% and allows underwater breathing.
Once a Druid achieves the level of 70, they gain the ability to access their beloved flight form.  This form gives Druids an added advantage over other classes because it is an instant spell, and can even be cast while the Druid is falling from high distances.  The first flying form increases speed by 60%, while the epic flying form increases speed by 280%.
When going down the restoration tree specialization, the Druid will gain access to the Tree of Life form.  This form transforms the Druid into a walking tree and increases the healing capabilities to every ally within 45 yards of the Druid by 6%.  During this time, the Druid may only cast restoration or neutral spells.  All healing over time spells cost 20% less mana as well.
Druids are effective healers because of their ability to stack spells that heal over time.  These spells may seem insignificant on their own, but when stacked together they create an income of health points that are often able to overpower the incoming damage of a raid boss.  If they need a boost of health points, they can disperse a healing over time spell to gather a quick heal.
Since the Druid cannot be polymorphed while shifted, and can easily shift to get out of polymorph, they are especially affective against mages in player versus player content.
Druids are the best class for beginners, because they are able to fill any role in a group.  They can be a healer, a tank, a DPS or even a caster, making it very easy to move to a refreshing new part of the game if you become bored of a particular role.  Just stick to this guide, and trust in its information, and you will become level 80 in no time at all.
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