You need to 'kick the
ball to the middle'. If you are applying insufficient rudder the needle is to
the left and the ball is to the left so you need to apply more rudder.
Left turn, ball right
means you are applying too much rudder ('kicking the ball too hard').
When the ball is inside
on the same side of the needle, it is said to be SLIPPING (CORRECT). in this case there is TOO MUCH BANK... the ball is falling
inside the turn....
When the ball is outside
on the other side of which the needle is pointing, the aircraft will be
SKIDDING (CORRECT) which means there's NOT ENOUGH BANK (think and see what
happen on the ground during taxiing. You’re turning but with NO BANK... the
ball is on the other side of the needle)