Easier - You don't have to be a great writer, perfect speller, or creative thinker to keep a personal journal. Journal writing means that you regularly write down your thoughts and experiences. Harder - A journal is a continued series of writings made by a person in response to their life experiences and events.
Diaries contain a description of daily events.
A journal may include those descriptions, but it also contains reflections on what took place and expresses emotions and understandings about them. It doesn't matter what you call your writing, either a diary or journal, as long as you see the distinction between these two ways of writing. Begin a Journal. Follow the tips and guidelines, but make it your own personal journal. Remember there are no absolute rules.