Alerts are used to attract user's attention for important information without interrupting the user's flow.
Alerts are available in 5 types primary alert, secondary alert, success alert, danger alert, warning alert, light alert and dark alert. To use alrt just use class name alert and also add classes accordingly like alert-primary, alert-secondary, alert-success, alert-danger, alert-warning, alert-light or alert-dark (eg class="alert alert-danger")