The /h/ sound in English is most often represented by the letter 'h' when it occurs by itself and not with any other consonants. Keep in mind as you learn English pronunciation that English spelling is rather unpredictable with a multitude of exceptions and variations. The rules sometimes seem to lack a predictable pattern. Fortunately there are only a limited number of 'phonemes', or sounds. That's why these pronunciation lessons focus on the phonemes and try to give only non-exceptional spelling examples. This should make it easier for you to master the individual sounds as you progress and start to encounter variations and exceptions.