To save your time, especially people who do not want to touch on code, I integrated Shortcode in Blogger to help you easily in setting up new section.
Purposes is to display Posts by tag (label).
We often use shortcode in Slider, News section.
You can see shortcode format from :
Layout -> HTML widgets (Slider or News) -> Edit.
It looks like:
[Tag Name] [Number posts to show] [Post type]
Tag Name is one of your blog labels.
Number posts to show: You can keep by default or change it.
Post type: Keep it default after you installed Raintemplates theme. Do not change it
Shortcode: [News]  [recent]
News: Tag name
3: Number posts to show on Website.
recent: Do not change it