The single most important action we can all take, in fighting coronavirus, is to stay at home in order to protect the NHS and save lives.
You should only leave the house for one of four reasons, and one of these is to provide care or to help a vulnerable person. Even when you are doing this, you need to do so safely. You should be minimising time spent outside of the home and ensuring you are 2 metres (6 feet) apart from anyone outside of your household.
The full government guidance outlines how you can help and, importantly, how to do this safely.