In some templates like the Minima template, you can easily change the font type, font color and font size of the Blog Header, Title and Description. However, there is no option under Template -> Fonts and Colors to change the font properties within the Sidebar to make the text different from the rest of the Blog contents. To change the font, you will have to modify the template and add the font properties into the relevant part of the CSS stylesheet.
CSS Font Properties
Take a look at this article on Links - Hover and Rollover Effects and zoom in on the section relating to fonts. You can see the various font properties that can be used for text within the template. These include:-
Insert Font Properties into Template
To have the CSS font declaration in the Sidebar, go to Template -> Edit HTML. Scroll down the template to this selector and insert the font properties and values.
In some templates, instead of .sidebar, you may see #sidebar or #side or variations of that. What you can do is to insert the font code and Preview the template. If the sidebar fonts are changed accordingly, you know you have inserted the code at the correct position.
Try out other properties if you need to, such as making the font bold or in a different font face.
If you want to change the text in the main Post body only, add the style here:-
© Tricks for New Bloggers