If you start off without reviewing the 'objective domain' then you will have no idea what to study and how deep to study it.
The server certification track of microsoft consists of three exams, 70-410, 70-411, and 70-412, each with it's own objective domain.
A nice video on the exam 70-410 and it's objective domain can be found on Microsoft Virtual Academy. It will give you a great understanding of what to study and how deep, make sure to check it out.
Install and configure servers (15-20%)
Configure server roles and features (15-20%)
Configure Hyper-V (15-20%)
Deploy and configure core network services (15-20%)
Real world experience is a must-have for this topic
Follow the IPV6 bootcamp
Install and administer Active Directory (15-20%)
Limited to below topics but deeply integrated
Create and manage Group Policy (15-20%)