Inspiration

Inspiration can be awarded for any possible positive reason. (You might wanna check with the DM, if you'll receive Inspiration after you've done something cool.)
Besides the usual advantage on an attack-, savingthrow or skillcheck roll, inspiration can be used for the following:

• Impose disadvantage on an enemy attackroll or savingthrow
• Turn a hit into a critical hit
• Get a clue from the DM on whatever the character tries to solve at the moment.

You can only ever have one inspiration. You’re either inspired, or you’re not.
You can freely give your inspiration to another player.