Soft and hard C and G
Before e and i, c sounds like ch in “church” and g like j in “jam”. Add an h (che, chi, ghe, ghi) and they turn hard: k and g as in “go”.
Reading the letters as in English: chi as “chee”, cena as “kena”, or the i in ciao and giorno said as a separate syllable.
Hear the difference:
China / slope
a ride / a dormouse