"For the first six months you own it, the Series I bond we sell from November 2021 through April 2022 earns interest at an annual rate of 7.12 percent. A new rate will be set every six months based on this bond's fixed rate (0.00 percent) and on inflation."

As someone who's never bought bonds before, how do I know the 7.12% won't change after the 6 months of the locked rate to the 0.00% and whatever pittance they decide to toss my way in an attempt to account for inflation?

Sincere question, I don't know anything about anything.