There are letters that represent a single phoneme, for example, the letter “T” like in: TA, TE, TI, TO, TU.
There are also phonemes that are exclusively represented by a single letter, as exemplified by the letter “T.”
However, there are other letters and phonemes that can be represented by two or more letters.
This is the case with the letters “C” and “G.” I’ve outlined it in the following tables or in this video (in Spanish).
Z, C, QU:

See some examples:

Special cases:

J, G:

See some examples:

And if you want to further improve your Spanish pronunciation, check my FREE course below.