forward slip and side slip.

Can any body explain what is the main diffrence between forward slip
and side slip.

What I understand based on my training is
The forward slip is used to loose altitude. so if your wind is coming
from the left, your left wing should be down. 1: Aileron into the
wind,  2: full Opposite rudder, 3: Double Descent attitude
Side slip: Is just enough rudder to keep the nose straight down the
runnway, airleron into the wind to keep you lined up one the runway.

So whenever you slip you put the aileron into the wind opposite
rudder.

Please comment