Hi, welcome to iPF!
After updating, reset is recommended: press and hold Home and Power button simultaneously until the Apple logo appears.
Also, restarting your device could help: turn it off, wait for a few minutes, then turn it on again.
Force close apps: double tap Home button to reveal the multitask bar. Then drag the thumbnails above app icons towards the top of the screen.
To get rid of your problem with the keyboard, try Mickey's suggestion.
Hope that helps.