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+1

For syncing, you can either pay for Obsidian Sync ($10 per month, which is a bit pricy)

If you have a mac/iPhone combo, then iCloud sync is natively supported.

Other than that, Syncthing works well on Android/Windows/Mac, but I heard Syncthing on iOS is not that great.

Obsidian Sync has been flawless for me (I got in on early bird pricing, so it's only half as painful).

Obsidian Git works well, and for getting stuff back and forth from a Git repo to iOS, Working Copy does the job.