Problem: How to unlock a phone when you forget its passcode
Visit android device manager in a web browser.
This method will erase the content from your phone. As of android 5.0, google has removed the ability to bypass the lock code without wiping the content.

Answer: You'll be able to get back into your phone, but you will lose any data (such as music and photos) saved to the device. This method will only work if you have android device manager enabled on your phone.

Problem: How to improve english pronunciation
Study how to form your mouth and tongue for each sound.
Look up how to shape your mouth and tongue for each sound or watch a native speaker as they talk. Next, look in a mirror and try to match that shape.

Answer: Look up where to put your tongue or teeth as well. These can also vary the pronunciation of a sound.

Problem: How to align garage door sensors
Turn off the power to your sensors by tripping the fuse for your garage.
You'll find this in your home's breaker box.
You won't actually be working with the electrical wiring, but it's always best to be safe when working with electricity.
Answer: Loosen the screws that mount each of your garage door sensors. Don't take them all the way out.