Here are some tips for your journaling efforts to be more effective:

1. Be yourself: remember this is your space and you talking to yourself, so be absolutely honest
2. Consider making it a habit
3. Focus on how you feel because that is the important part: to vent out and express
4. Revisit your old writing from time to time; flip the pages and look at what you've written to learn about yourself and your experiences
5. It doesn't matter if your entries aren't very long
6. It is best to hand write in your journal, but if you're more comfortable typing, that's OK too

Apply these tips to make the most of your journaling.