China is the only one I know who did currency manipulations, are there others?

Not any that I'm aware of, at least among the major trading partners. If you look at the fact sheet announcing the tariffs, you can see that the "currency manipulation and trade barriers" small print itself isn't even accurate. It's a laundry list of everything they can describe about another country's economy to push that "tariff" number as high as they can. My favorite?

Countries including China, Germany, Japan, and South Korea have pursued policies that suppress the domestic consumption power of their own citizens to artificially boost the competitiveness of their export products. Such policies include regressive tax systems, low or unenforced penalties for environmental degradation, and policies intended to suppress worker wages relative to productivity.

So other countries don't get to make their own decisions about their domestic tax systems, environmental enforcement, or measures that relate to worker wages? And it's the GOP that's saying that all of those other countries don't have progressive enough taxation, too low of penalties for environmental damage, and not allowing things that allow worker wages to rise to productivity - while they are literally in the process of reducing the progressivity of the U.S. tax code, reducing environmental regulation and the ability to enforce it, and undermining labor union protections? But that doesn't count on our side of the ledger of non-tariff barriers?

whitehouse.gov - Fact sheet president donald j trump declares national emergency to increase our competitive edge protect our s