While designing for the web or the mobile applications, a natural free flowing text can be used for the general content, but when it comes to actions... can we use CAPITAL LETTERS.
Answer
As a general rule of typography using all caps reduces readability for long segments of text. It should never be used for paragraphs especially, and only for short headlines.
You can certainly use all caps in buttons, though, because buttons by nature contain short segments of text. In fact, all caps is the convention for buttons in Google's Material Design. You can see how they specify this at https://www.google.com/design/spec/components/buttons.html#
One thing I notice Google doesn't do is increase the letter-spacing when using all caps. In general it increases readability to add some spacing between all cap letters. See http://practicaltypography.com/all-caps.html
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