I was discussing this with year 11 today: making your own blog as a way of communicating what you are learning.
Teaching is one of the most effective ways of learning something. It challenges you to communicate an idea in a clear, effective and creative way. This means that you are unlikely to forget it.
Have a look at some of these for inspiration:
Or log onto getrevising.co.uk and sign up for hundreds of resources uploaded by students, teachers, and people who just like doing that kind of thing.