Widget Plugin allows you to embed posts into your sidebar category, tags. Also you can show latest posts,old posts and posts by any order you want in
Installation process is a easy 4 step procedure.
Download the zip folder named igit-related-posts-widget.zip
Unzip the folder and put it in the plugins directory of your wordpress installation. (wp-content/plugins).
Activate the plugin through the plugin window in the admin panel.
Go to apperance->widgets and drap and drop IGIT Posts Slider widget and configure settings.