Writing letters is an important milestone for children and practicing their phonetic sounds is a key step in the process of reading.
Children do need to write on paper with a pencil for the school work. But, in the early stages when they are beginning to learn writing and phonetic sounds, it should be interesting and fun in order for them to be motivated to do it.
Make it fun and provide different materials for children to practice writing letters on a variety of mediums.
Corn flour, sand, salt, sidewalk, paper, shaving cream are some ideas of materials they can use to practice writing letters.
Children can use their fingers, chalk, paint brush, nature materials like leaves & flowers, household items like buttons, beads, paper clips etc to practice making and writing letters.
Simple play dough can be used to encourage children to mold and make letters with them. It strengthens their finger muscles, is a fun, sensorial, visual and exciting activity for them.
Observe the child, see what kind of learner they are and provide necessary materials/support and encouragement to make learning writing letters fun for them.