Visa requirements in Europe

Just booked a cruise from Port Canaveral, Florida to Barcelona Spain!

Clark has spoke about a visa requirement to travel to Europe.
I did extensive reading on the state department travel site & it says a visa is required to Spain.
However, it appears there’s a system for visas in Europe called a “ETIAS certificate”. This system is not up & running yet.

It is expected to be operational in 2025.
My cruise is in May of 2025.

There is a saying that I love, “you don’t know what you don’t know”.

Am I correct in saying that all I need for my cruise to Spain is a US passport (expiring six months after arrival) & this “ ETIAS certificate”?

Am I missing something?
Thanks in advance…