The folly in this charade is there's no way to enforce any "deal" China agreed to. Maybe they play nice for a few months but it's right back to business as usual after that.
I'm assuming you don't what a 401k is? it's a retirement account usually through your employer that includes many different investments much like a mutual fund or etf but more diversified. You don't/can't actively trade with it but you can choose how aggressive you want it to be managed. I'll still trade independently but I'm hedging with my retirement till after this current mess is resolved or the economy is coming out of the impending recession.