Sicilian Defense, Classical Variation (Theory, Strategy & Lines) - PPQTY

Sicilian Defense Sidelines

Every variation of the Sicilian Defense : r/chess

How to Beat the Sicilian Defense - EnthuZiastic

Sicilian Defense: Old Sicilian Variation - Chess Openings

Top 5 Most Common Mistakes/Traps in the Sicilian Defense - Remote Chess Academy

Dangerous Weapons: The Sicilian - John Emms and Richard Palliser – Everyman Chess

The Modernized Anti-Sicilians – Volume 1 – Rossolimo Variation - Thinkers Publishing

Chess Common Lines In The Sicilian Defense Poster for Sale by cevyl49

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