simplest way to make a sweater?
i want to make a sweater but i don't know how...
knitting, sewing, both ?
well anyway I still gonna need a sweater and fast.

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It also depends on which you enjoy the most, and upon the equipment you have (jolly hard to knit without needles!)
The quickest version would be to cut and sew from thick fleece.
The version that would fit the widest range of sizes, and conceal the most errors in manufacture, would be knitting.