There are so many out there. Today I will only cover the basic from my 1st grader (DD finished 1st grade). We have /sh/ like in ship and fish. /ch/ like chin, chat and much. /th/ like in thin and math. /wh/ like wham and what. /ck/ like duck and buck. You can see see two digraphs in the word whack and there are others. When you see the above examples they contains only one sounds. The word wish is counted with 3 sounds when doing the finger stretching.