i'm still trying to get my head around the whole follow-on sowing / crop rotation thing

so ..... as roots (spuds) are followed by peas / beans etc .... so i could plant these out now, as i lift the spuds ...... and i would sow more peas / beans etc in that same bed in the spring ... ?

so ... if spuds are followed with peas / beans (legumes etc) then i shouldn't really be planting brassicas (cabbage) there?