Feats are additional options available to grow your character. Feats are available for all characters, regardless of class, unlike Disciplines, which are available only members of a certain class.
Some Feats have prerequisites that must be met before you may take that feat. These prerequisites may be a certain Base Attack Bonus, Magic Attack Bonus, other Feats, Skill Ranks, or Size. You may take a Feat only if you meet all prerequisites for that feat. You may gain a Feat at the same level that you meet the prerequisite.
If you take a Feat and then lose one or more prerequisite, you may no longer use that feat.
Any Feat can be chosen at levels 1, 3, 6, 9, 12, 15, and 18 as long as you meet the prerequisites.
Most Feats are General Feats. These Feats do not have any special rules that apply to them.
Each Heroic Class has a list of Feats that are considered Bonus Feats for that Class. At every even level, you may choose a Feat only from the Bonus Feat list for that class.
Metamagic Feats are special Feats that increase the utility of magic of any school. Metamagic feats can be applied to any spell that the Feat can have an effect on. A Metamagic Feat can be used at any time and it does not increase the casting time of the spell. All Metamagic Feats cost the user extra Mana Points to cast the spell the Feat is applied to.