Sicilian Defense Accelerated Dragon - An In-Depth Guide

Sicilian Defense Classical Variation –

Sicilian Defense: Playing Against it - Complete Guide - TheChessWorld

Common Variations in the Open Sicilian : r/chess

Sicilian Defense: The Chelyabinsk Variation

How to Beat the Sicilian Defense - EnthuZiastic

O'Kelly Sicilian: Complete Guide - TheChessWorld

Sicilian Defence 1.e4 c5: Second Edition - Chess Opening Games

Mastering the Sicilian Defense by Danny Kopec

Why would White play 2.a3 as their 2nd move in the Sicilian Defense? It's not an accepted opening and I see no benefits. How would you go about strategizing a reply, as

Fighting the Anti-Sicilians: Combating 2 c3, the Closed, the Morra Gambit and other tricky ideas by Richard Palliser – Everyman Chess