Writing, like every other skill your child has learned, and will have to learn, is something that you, as a parent, have to help them learn. In this case, your main function will be to provide them with the tools to learn. Buy them paper, colouring books, crayons or even a chalkboard and chalk.
You will need to watch your child carefully as he or she practices his scribbles for a while – even with paper and colouring books, they’re likely to test out walls, furniture, and other items with their crayons if you’re not careful! Washable crayons or chalk should make cleanups a little easier though.
Since safety is a factor, you want to avoid sharp drawing and writing implements, like pens and pencils. Your child is probably not skilled enough to use them safely, and if they fall on them, or pokes himself in the face, you could have serious injuries on your hands!
When it comes to writing letters and numbers, try not to push too hard. Let your child learn at their own pace. After all, they will learn all the formalities of writing when he or she goes to school. In the mean time, make learning to write fun, and make sure you read to your child a lot, to foster a love of words.