Automation of server builds minimizes human error, ensures that environments are identical, and saves time building servers. This article from Mircea Opera demonstrates provisioning one server or multiple load-balanced servers in AWS with code.
A common topic for questions on SQL Server forums is how to plan and implement upgrades to SQL Server. Moving from old to new hardware or moving from one version of SQL Server to another. There are other circumstances where upgrades of other systems affect SQL Server DBAs.
A look an evolution of infrastructures from Bill Immon.