How to create a website into responsive in simple steps?

One very goog point to start is to read Google's developers guide into responsiveness, here: https://developers.google.com/web/fundamentals/layouts/rwd-fundamentals/set-the-viewport?hl=en
You have to have in mind that responsiveness is all about setting the correct media queries to your css file and having set core meta tags in your html file, like the one bellow that sets the viewport and it is crucial: <meta name="viewport" content="width=device-width, initial-scale=1">.
Hope I helped you.

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