It depends entirely on what *you* like to eat. Most native or naturalised fruits are relatively easy. If you're going for fruit trees, check they are on dwarfing root stock, learn how and when to prune them, and check wether theh need a different variety to pollinate them, as not all are self pollinating Blueberries need two or more *different* varieties to get a decent crop, and need ericaceous compost. Strawberries are easy. The plants fruit best in year 2 and 3, and you can pot on and plant out runners ( new plants that form ) to replace old plants after year 3. Rasberries - There are summer and autumn fruiting. Cut autumn fruiters down to an inch or two above soil level this time of year (Dec-Feb ) and summer ones cut down once they finish fruiting. Rasberries do spread so keep an eye on them over time and dig up escspees. Also remove old stems that no longer fruit, or any obviously dead or diseased ones.