Readers reply: What are the greatest life lessons?

The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical conceptsWhat are the biggest life lessons? Things like how to navigate uncertainty, or what clothes never to wash together? What are the best life-enhancing secrets – big or small – that took years to discover and now need to be shared? Campbell Norris, by emailSend new questions to nq@theguardian.com. Continue readi