During early childhood education, They begin to lay the foundations for many areas and areas of life of small. One of these areas is literacy, that does not mean anything other than the union of two processes such as reading and writing.
I do not want to get into too much detail about definitions and theories, there are many authors who argue that we need to develop from writing letters, syllables followed by, words, etc. While others argue that it should be done it is to take the most complex structures and "desmigarlas" to understand them better.
What is certain is that during the early childhood education your children will work the directionality of letters, therefore, it is good that so you can help them know what it is and how it is done.