For our youngest writers who are still learning to hold pencils, form letters, and make sentences, the instructional emphasis must be on mastering those foundational skills. Below are a few articles about instruction that is appropriate for them. Without these skills and insights, it's unlikely students will be able to participate in the literacy of the disciplines.
https://www.readingrockets.org/blogs/shanahan-on-literacy/how-teach-writing-kindergarten
https://susanjonesteaching.com/how-to-teach-writing-in-kindergarten-writing-strategies-in-k/
https://www.weareteachers.com/kindergarten-writing/
Teaching Elementary Students to be Effective Writers: what does the evidence say?
The Writing Process for Primary Grades