You are skilled at avoiding detection, allowing you to slip past foes or strike from an unseen position.

Check: Your Stealth check is opposed by the Perception check of anyone who might notice you. Creatures that fail to beat your Stealth check are not aware of you and treat you as if you had concealment. You can move up to half your normal speed and use Stealth at no penalty. You may move up to your normal speed, however you take a –10 penalty. It's impossible to use Stealth while attacking, running, or charging.

Creatures gain a bonus or penalty on Stealth checks based on their size:

If people are observing you using any of their senses (but typically sight), you can't use Stealth. Against most creatures, finding cover or concealment allows you to use Stealth. If your observers are momentarily distracted (such as by a Misdirection check), you can attempt to use Stealth. While the others turn their attention from you, you can attempt a Stealth check if you can get to an unobserved place of some kind. This check, however, is made at a –10 penalty because you have to move fast.

Breaking Stealth: When you start your turn using Stealth, you can leave cover or concealment and remain unobserved as long as you succeed at a Stealth check and end your turn in cover or concealment. Your Stealth immediately ends after you make an attack of any kind, whether or not the attack is successful (except when sniping as noted below).

Sniping: If you've already successfully used Stealth at least 10 feet from your target, you can make one ranged attack and then immediately use Stealth again. You take a –20 penalty on your Stealth check to maintain your obscured location.

Creating a Diversion to Hide: You can use Bluff to allow you to use Stealth. A successful Misdirection check can give you the momentary diversion you need to attempt a Stealth check while people are aware of you.

Action: Usually none. Normally, you make a Stealth check as part of movement, so it doesn't take a separate action. However, using Stealth immediately after a ranged attack (see Sniping, above) is a move action.
Try Again: No

You can attempt to hide any evidence of your presence as you move, but this requires that you move at half speed in any environment other than stone streets

Hiding your tracks in this way only relates to the imprint left behind by your physical presence. It does not apply to any disruptions resulting in binding the elements, such as upturned earth

Your trackless step skill is opposed by Tracking

You may move at full speed, at disadvantage

Action: Used as a part of a move action, penalties described above
Try Again: No

Spying is a similar to the Gather Information skill used to gather information. If you wish to eavesdrop on a specific person in the moment, use Stealth to avoid being detected and moving into a good position to hear certain information. You can always simply roleplay spying if you wish

If instead you wish to gather information without any socializing, or you wish to gather information that cannot be obtained by socializing, then you will use Spying. A spy check is opposed by Perception. The information gained by the check corresponds to the difficulty of obtaining the information in question (Trivial, Easy, Moderate, Hard, Very Difficult, Near Impossible)

Action: Varies
Try Again: Yes, but if you have been detected in an area, you are at disadvantage for future rolls