Depending on your project, these are the NextJS-specific Tina packages to work with:
next-tinacms-github: This package provides helpers for managing the github auth token for requests, as well as providing helpers for loading content from the Github API.
next-tinacms-json: This package provides Git form helpers for editing content stored in JSON files in the local filesystem.
next-tinacms-markdown: This package provides Git form helpers for editing content stored in Markdown files in the local filesystem.