Hi! It’s best if phonics is taught systematically, moving from simple to more complex sound combinations. Working on rhyming (both recognizing and creating his own rhymes) is a good place to start. Another important skill involves phonemic awareness (being able to identify and manipulate sounds). You can work on having him tell you the beginning and end sounds in words, as well as have him name two words that begin with the same sound. You can also work on having him break words down into individual sounds (e.g. name the sounds in the word “cat”) as well as blend sounds together (e.g. you say “s-un” and he has to tell you the word). A multisensory approach that uses a variety of senses (auditory, visual, tactile) can often be helpful. Best wishes!