you can transport hydrogen.

If you mean transport fuel tank full of hydrogen to power an airplane or truck, it's really awful due to its physical properties. It penetrates materials, hydrogen gas density is horribly low, liquifying requires huge energy effort, and the due to low specific heat it boils away really really fast.

If you want a fuel with bare minimum reasonable properties made out of hydrogen, then you could do synthesis with nitrogen to make ammonia. It's corrosive and toxic, but at least storage requirements are sane. Still it has half of the energy density of gasoline and nitrous oxide emissions are problem when combusting.