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Practice until you can't make it wrong.

Accidental DBA Series at SQLSkills website.

Index
All about SQL Server Indexes from Brent Ozar

Find SQL fast in SQL Server Management StudioSQL Search from redgate

Introduction to Query Processing and Optimization
by Michael L. Rupley, Jr.
Indiana University at South Bend
mrupleyj@iusb.edu

WARNING : It is ILLEGAL to scan hosts without permission.

"John the Ripper is an Open Source password security auditing and password recovery tool available for many operating systems."

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Everything is practice.

— Pelé