What does one write in a Journal?

Since I'm still new to Daily Strength, I've just come across the Journal writing section.  What does one write in a Journal?  I've never done this before.  Therefore, based on the headings, I chose "Inspiring." I inspire to be inspiring to others.  For this is what I will ponder today!  I'm glad to be on here and learning that there are many others with questions, hopes and dreams.