Android - How to create a newline on keyboard

Simply press the enter/return button in your key board. It is located at the right botton corner of your keyboard.

In some cases, this button sends the SMS (or submit applications, in cases of forms in websites) If your device does that, simply hit enter/return button while holding the shift button or the upside arrow

Hope this helps.

I finally found a solution. So I was facing the problem in WhatsApp and my new line button was replaced by the enter key, so I went to the setting and I turned off the option " send messages with enter key" and voila, my new line button is here.