How can I help my child learn to read?

Practice letters. And read lots of books together. Let your child "read" the books as well. Make reading books part of the bedtime routine. Simple pattern recognition books with good illustrations often help kids learn to read because they can follow the pictures easily.
Read to them. The best way is to read to them15-30 minutes each day, every day, always.
Phonological aware- Ness, seen typically in 70% of 5-year-olds & 100% of 6-year-olds, is needed to decode words (read). Learning phonemes, the smallest units of sound in a language (44 in english) & sound-symbol associations starts @ 3-4. Kids who can't process "b sounds like buh; ph sounds like fuh" or "muh-moose; take away the m & put a g, what will it be?" will have dyslexia. Read mother goose rhymes & dr. Seuss.