Veg plot project

I don't do raised beds but have traditional veg plots that get dug over. I would think your first thought should be what you want to grow, then consider rotation (or possibly not). I don't grow potatoes and not many brassicas so I rotate loosely over two big plots each divided in half, i.e 4 spaces, legumes, roots, onions and misc - sweetcorn/courgettes etc. That's the plan, but it never works