Where can I start from zero with nRF52

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I know nothing about bluetooth like ble_app_uart , uart to where?how to use this uart? like ble_app_alert_notification, alert? beep? vibrator?

any tutorial of develop? forget that infocenter, it doesn't describe details

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You are crazy:) There are all the tutorials under "Tutorials" button just few pixels above the button you used for asking this useless question... have you read them? Any specific point where it didn't work for you?