Are you talking about moving the playback cursor when playing? If so, by default LEFT/RIGHT arrow moves 1 second or SHIFT-modified LEFT/RIGHT moves 15 seconds. You can change the seek distances in the “Seek Time when playing” settings in Playback Preferences .
You can’t move behind the playback cursor, though.
If you want to move the “Seek Time” distances specified in Playback Preferences when not playing, use , (comma) to move the short distance left or . (period or full stop) to move the short distance right. Hold SHIFT with . or , to move the longer distance left or right. Those commands also work the same way when playing.
If you want to use a foot pedal you will need a foot pedal (or foot pedal software) that can deliver key presses. You can change the shortcuts that operate the cursor move and seek commands in Keyboard Preferences .