[avgas100]

Soft Reset is basically like restarting your pc, nothing will be changed, to soft reset hold the power button for afew seconds, then choose yes when prompted.

Hard Reset will reinstall the operating software you are running on the phone, this will erase all your data (not SDcard), and bring the phone to a stock condition ( or stock condition of whatever ROM you have installed). To hard reset, hold the "call" button & "call end" button, then press the little reset button with you stylus.

next time just use the search function of the site