- Writing groups. They often have sessions that provide feedback and also help writers find/build a sense of community. Your son would also get to listen to other writers talk about their work, problems they’ve run into and overcome, and other aspects of their craft.

- School (sometimes library) writing workshops. This helps students develop bonds with their peers and helps both students: the ones giving feedback are learning to be better editors.

Both of these offer a lot of value in terms of community building and also getting feedback from people vested in the the craft of writing.