You can automatically show excerpts on your WordPress site’s homepage even if your theme doesn’t support it you can display them without touching the code.
Auto Excerpt Everywhere is a free WordPress plugin, if you like showing excerpts in your site without touching the code then install and activate it. It automatically tries to display your custom excerpt text and when it doesn’t find it it will show an auto generated excerpt. Also you can:
- Define excerpt length
- Custom read more link
- Or attach a thumbnail