Q: i forgat my password

How do I change or recover a forgotten Apple ID Password?

If you've forgotten your Apple ID Password or want to change it, go to My Apple ID and follow the instructions. SeeChanging your Apple ID password if you'd like more information.

Forgotten Screen-Lock Passcode

Connect the iOS device to your computer and try to make a backup

iOS: How to back up

Then restore via iTunes. The iOS device will be erased. Place the iOS device in Recovery Mode if necessary to allow the restore.

If recovery mode does not work try DFU mode.

How to put iPod touch / iPhone into DFU mode « Karthik's scribblings

For how to restore:

iTunes: Restoring iOS software

To restore from backup see:

iOS: How to back up    

If you restore from iCloud backup the apps will be automatically downloaded. If you restore from iTunes backup the apps and music have to be in the iTunes library since synced media like apps and music are not included in the backup of the iOS device that iTunes makes.

You can redownload most iTunes purchases by:

Downloading past purchases from the App Store, iBookstore, and iTunes Store    

Forgotten RESTRICTIONS Passcode

- Restore from a backup that was make before you added the Restrictions passcode. If you restore from a backup made with the Restrictions passcode the Restrictions passcode is also restored. Place the iOS device in Recovery Mode if necessary to allow the restore.

- Restore to factory settings/new iPod. . Place the iOS device in Recovery Mode if necessary to allow the restore.