Welcome Laura!
If you’re a pro member you can check out lesson two to the explore course.
https://www.lenspiration.com/lesson/explore-2/
Or here are some free articles.
https://www.lenspiration.com/2013/09/how-to-make-the-background-blurry/
https://www.lenspiration.com/forums/topic/how-to-blur-the-backround-in-a-family-picture/
https://www.lenspiration.com/2015/12/christmas-tip-blurry-background-christmas-lights/
Always keep learning!
-Hannah