onions and srawberries!

From my subect I guess you can tell I am not the most knowledgable of gardeners. My onions have developed seed heads, which I think means they have bolted, why has this happened and what shall I do with the onions at this stage?
My strawberries are a disaster, we decided to grow them through black plastic on raised beds, the plants are very small and what strawberries there were have been eaten despite covering them with netting.  Any advice for a novice allotmenteer.


Jude

we had same problem with our strawbs initially we put wire covered in net on them and surrounded them with straw (didnt grow thro plastic).they are doing well now and hardly water them  weeds not too bad cause of straw and whatever was getting is to nibble had not got back in.