I often get asked how to create the “Read More…” link in WordPress posts, and also how to customize it on a per post basis. It’s quite simple actually.
The first method is to use the Insert More Tag (Alt + Shift + T) in the WordPress visual editor but I prefer to flip over to HTML mode and customize it directly:
<!--more Continue Reading!-->
or simply…
<!--more-->
More information can be found in the WordPress Codex.