If you are using Word much at all, if it is an important tool in your life, it is really time you took a bit of time to learn about Styles. Here's why: Importance of Styles in Word
Here's a good spot to get started: Tips for Understanding Styles in Word by Shauna Kelly

You can set the paragraph style in one paragraph to use a different style in the following paragraph. This gets triggered when you press Enter at the end of a paragraph. (If you press enter somewhere in the paragraph not at the end, the current style continues.)