语法上都可以
用ing 是泛指这类事
如果指的是说话以后将要去落实的事最好用to learn.因为不定式表将来
My biggest challenge（主语） is（系动词） learning how to behave at the dinner tablel（动名词短语作表语）
My biggest challenge（主语） is（系动词）to learn how to behave at the dinner tablel（不定式短语作表语）
请在客户端右上角评价点“满意”即可,
My biggest challenge is learning how to behave at the dinner
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