The first tip I would give you is that showing you have had many experiences in your life is definitely important, however it would be even better if you could explain what you learned from them and in particular how they affected your personality and thus your current decisions. Everything can be used in your favor, but don't forget to stay relevant to the subjects you are applying for. If you are an international student, don't forget to mention the reasons you have decided to come to study in the UK. Always remember to be brief and concise, there are many things you have to fit in only 4000 characters and 47 lines. Finally, the most important thing in my opinion is trying to avoid overdoing; sometimes is better to have a good structure, few relevant pieces of information about yourself and the reasons behind your choice, fundamental experiences that helped you making your decision, significant extra-curricular activities and passions and, to conclude, a brief explanation of how you intend using your degree.