Good SQL Server Blogs
SQL Release Services Blog
https://blogs.msdn.com/b/sqlreleaseservices/
CSS SQL Server Engineers
https://blogs.msdn.com/b/psssql/
SQL Server Engine Tips
https://blogs.msdn.com/b/sqltips/
Microsoft SQL Server Development Customer Advisory Team
https://blogs.msdn.com/b/sqlcat/
SQL CAT(Customer Advisory Team)
https://sqlcat.com/
SQL Server Storage Engine Blog
https://blogs.msdn.com/sqlserverstorageengine/
Tips, Tricks, and Advice from the SQL Server Query Processing Team
https://blogs.msdn.com/b/sqlqueryprocessing/
SQL Server Performance
https://blogs.msdn.com/b/sqlperf/
SQL Programmability & API Development Team Blog
https://blogs.msdn.com/b/sqlprogrammability/
Euan Garden's BLOG
https://blogs.msdn.com/b/euanga/
SQL Server - Blogs
https://technet.microsoft.com/en-us/sqlserver/bb671052.aspx
Karthick PK 's Blog
https://blogs.msdn.com/b/karthick_pk/
Karthick P.K SQL Server Blogs
https://mssqlwiki.com/sqlblogs/
MSSQL tips
https://www.mssqltips.com/