I'm really interested in finding resources to help my team members develop their writings skills. Tech skills are comparatively easy to find materials for, I think. At this point I think writing skills are so important it's the biggest priority for further their careers, given the level of technology experience they have.
Sorta, but most of the tech skills that are easy to find information on are closer to grammar and punctuation than to writing.
Just like software development, the way you train people to write is have people write and, importantly, have people review and edit it.