If you are building your own wordpress theme and suddenly you realize that you need to remove all default widgets. Then below code is the right solution for you
You can limit the number of characters of excerpt to display on page.
When you link to your own post a self ping is generated by wordpress every time your post is viewed. You can easily avoid self pings by wordpress.
Excerpt is short extract from a post. If you want to display excerpt on your wordpress website page.