Info on Feats and How to Read Them

How to Read Feats:

Prerequisite(s)
You must meet these additional requirements to take the feat. If you ever lose a prerequisite for a feat (for example, if you use the retraining system to replace training in a prerequisite skill with training in a different skill), you can’t use that feat thereafter. If this entry is absent, the feat has no prerequisites.

Benefit
This section (which might be more than one paragraph) describes the advantage you gain when you take the feat.

Special
Occasionally, special rules apply to a feat. This entry specifies whether you can take the same feat multiple times and any provisions that apply if you do so. It also can indicate any other requirement for using the feat.

There are three "tiers" of feats Heroic, Paragon, and Epic feats. Heroic feats can be learned by every level 1-30, Paragon feats can be learned only by levels 11-30, and Epic feats can only be learned by levels 21-30.