Personal site
https://medium.com/munchy-bytes/microsoft-sql-server-gurus-you-should-follow-2fce3e5120e4
https://www.brentozar.com/blitz/
https://ola.hallengren.com/sql-server-index-and-statistics-maintenance.html
github
https://github.com/BrentOzarULTD/SQL-Server-First-Responder-Kit/