Cloud Skills Boost always updates users via email for exciting offers and discounts. To get notified, please make sure that you have checked the option 'Send me occasional product updates, announcements, and offers’ so that you can receive all the promotional emails.
You can enable this option following those steps:
1. Click your avatar and select Settings
2. In to the General account settings page
3. Enable the option 'Send me occasional product updates, announcements, and offers’.
4. Click on 'Update settings'