Absolutely nothing. I’m more of a mile-wide-inch-deep type than a mile-deep-inch-wide type, which is to say a generalist rather than a specialist. So, I do have some insight into how to think about thinking about matters diverse and sundry.
On what subject(s) are you an authority?
If by authority one means “having such expertise / understanding that you can just take my word for it with regards said subject,” then I claim no such authority — graduate degrees and certifications notwithstanding. I certainly don’t take anyone else’s [single source] word for anything, and I take the Jnani’s view that all knowledge should be subjected to one’s own experience and reasoning.
If, however, one means “having more insight than anyone else about the subject,” I would claim authority on the experience of operating the mind / body that is typing this reply.
Tiger Riding for Beginners 