When children are first learning to read and write we want them to feel successful. After all, success is motivating. A trap that many children fall into is being told they are not doing something right when they are actually making logical decisions. For example, they may write the word 'frog' like this: fRog. Mixing upper case with lower case letters. Or when they are trying to sound out a word they may try to use letter names instead of letter sounds. Each time they are corrected for one of these 'mistakes', it feels frustrating because in a way they are choosing the correct letter just not in the right form.
To simplify, start with only lower case letters since the majority of written language is in lower case, and only teach letter sounds rather than letter names since this is how they will learn to read. Don't worry! Eventually, they will learn it all, but this helps prevent frustration and fatigue.
