The Dashboard is generally the first page you see when you login in Marketing Cloud. Although, this can be changed via Default Login Preference page.
New Security Features in Marketing Cloud
Marketing Cloud Security Settings allow you to control login, access and roles and permissions for the users. Alos, allows you to limit scope for the APIs.
You will love the relationship b/w Journey & MobileConnect in SFMC?
Sending Mobile messages through a Journey is not as straight as sending emails. For SMSs, we need Mobile Number in correct format & Locale for each contact
Introduction to MobileConnect, a really interesting tool
Mobile Studio enables marketers to engage/connect with mobile users via SMSs, push messages on apps and via Line to broadcast to a larger audience.