On the Microsoft MVA there a a great basic course on security, This course you can prepare for MTA Exam 98-367. Build an understanding of security layers, operating system security, network security, and security software. The course leverages Microsoft Official Academic Course (MOAC) material for this exam.
Topics include
Authentication, Authorization, and Accounting
Understanding Security Policies
Understanding Network Security
Protecting the Server and Client
The link is here for taking training