You are educated in a field of study and can answer both simple and complex questions. Like the Craft, Perform, and Profession skills, Knowledge actually encompasses a number of different specialties.
Many of the Knowledge skills have specific uses as noted on Table: Knowledge Skill DC's.
Below are listed typical fields of study.
Answering a question within your field of study has a DC of 10 (for really easy questions), 15 (for basic questions), or 20 to 30 (for really tough questions).
You can use this skill to identify monsters and their special powers or vulnerabilities. In general, the DC of such a check equals 10 + the monster’s CR. For common monsters, such as goblins, the DC of this check equals 5 + the monster’s CR. For particularly rare monsters, such as the tarrasque, the DC of this check equals 15 + the monster’s CR or more. A successful check allows you to remember a bit of useful information about that monster. For every 5 points by which your check result exceeds the DC, you recall another piece of useful information.
Usually none. In most cases, a Knowledge check doesn't take an action (but see “Untrained,” below).
Retry? No. The check represents what you know, and thinking about a topic a second time doesn’t let you know something that you never learned in the first place.