All words are made up of sounds.
In the English language, we use 44 sounds, but we only have 26 letters. This means that one sound can be represented with one, two or three letters. This can become confusing for beginning readers, so it is important that we teach them how to read in a systematic and explicit way.
Read Write Inc. is a popular phonics scheme. Like all phonics schemes, it teaches children the sounds in English, the letters that represent them, and how to form the letters when writing. Read Write Inc. Phonics includes reading books written using only the letters they have learnt at each level (and a small number of separately taught tricky 'red' words). The children will quickly feel confident and successful.