Where can I start from zero with nRF52

[QQ645116977]

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

[shibshab]

Bluetooth Low Energy

ble_app_uart

ble_app_alert_notification