There are many attractive WordPress themes that webmasters can use without paying anything. Some of those themes might have text font size either too big or too small and you have to change the size to make your blogs reader-friendly. Users can also try zoom+/- option of the browsers to change the text size, but webmasters should not leave it on users.
There are a couple of ways to change the font-size in WordPress theme. The easiest way is to use customize option of the theme if the theme allows changing the font-size. The theme I am using does not have that option, so I will show you how to change the font size using style.css of your theme.
Step 1: Open your website in Chrome. Select the text whose font size you want to change and then right-click. Select Inspect element from the pop-up menu.
Step 2: It will show you two panels. On the right panel, select Computed and search for font-family and font-size.
Step 3: Open style.css in a text editor. Search for “Typography” and if it’s not there, search for the font-family you got in step 2. Along with that font-family, you will also find the size. Change the value of the size as per your wish and reopen your page. Make sure you deleted the cache from the browser and you have not enabled any cache module for the WordPress.
Hopefully, these steps will help you to change the font-size of the text in a WordPress theme.