To change the font style and size in Google Docs, start by opening your document at docs.google.com. Highlight the text you want to format, or simply place your cursor where you want to start typing in the new style. In the toolbar at the top, click on the font name dropdown (it usually shows “Arial” by default) to select a different font style from the list. To change the size, click the number next to the font name and choose your preferred text size from the dropdown, or type in a custom size manually. These tools allow you to customize the appearance of your text for better readability, design, or professional formatting.