wtf do these TSQL repos do?

Popular TSQL repositories on GitHub, each decoded: what it actually does, its stack, and how to run it.

brentozarultd/sql-server-first-responder-kitA set of SQL Server diagnostic stored procedures (sp_Blitz, sp_BlitzCache, sp_BlitzIndex, sp_BlitzFirst) that
dmcteknoloji/sql-server-2025-kitapCode samples and errata repo for a free Turkish-language book on Microsoft SQL Server 2025, covering classic D