Anyone can advise anyone on anything, subject to federal and state regulation. For example, you need licenses for real estate, insurance, securities and investment management. You don’t need licenses for rare coins, wine or comic books.
Bitcoin and Ethereum are not securities. But many other digital assets are, as are the mutual funds and ETFs in this space. So, you would need licenses.
If all you’re doing is education, and not managing money for a fee, then I don’t think licenses would be needed. States often have lots of license requirements – for everyone from hairdressers to masseuses – so check on all this with a local attorney.