Independent guide. Not affiliated with, endorsed by or speaking for NIH or NIGMS. No registration, no official meeting business here.
TWD Programs GuideResearch training, explained

Guides

Guides for program directors and trainees

Longer how-to pieces for people who run training programs and for the students and postdocs in them. Start with the application guide if you're writing a T32 or T34, or with the student guide if you're choosing a path.