There are cautions for some types of slip in a Cessna. Clearly if you land crosswind you are slipping. The extract below is from a C172S POH which does not mention the word avoid. Many pilots are of the understanding you cannot safely slip a Cessna in any circumstances. If slips were totally unsafe, Cessna would say "Slips Prohibited".
LANDING
NORMAL LANDING
Normal landing approaches can be made with power on or power
off with any flap setting within the flap airspeed limits. Surface
winds and air turbulence are usually the primary factors in
determining the most comfortable approach speeds. Steep slips
with flap settings greater than 20° can cause a slight tendency for
the elevator to oscillate under certain combinations of airspeed,
sideslip angle, and center of gravity loadings.