There are many different ways to store hydrogen. You can store it in tanks under pressure. You can store it underground in salt caverns, which is happening in the U.S. You can convert it into another product such as ammonia, and you can transport it long distances. You lose about 30% of the efficiency on hydrogen by doing that. Also, like natural gas, you can store it in pipelines if you have a dedicated pipeline network, and that can provide quite suitable and long-term storage.
Those questions haven't yet been sorted out. Again, I think we're a ways away before being able to answer those.