Sicilian Defense: Kalashnikov Variation with GM Misa Pap

Is the Sicilian french variation the best variation in the

Understanding the Sicilian

Sicilian Defense: Old Sicilian - Magnus Carlsen Best 15

Sicilian Defense: Old Sicilian Variation - Chess Openings

Sicilian Defense Variations & Theory

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

Chess - The Sicilian Defence

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

Simple and Solid Chess Opening against the Sicilian Defense for White - Remote Chess Academy

I'm trying to understand the Sicilian Defense - Kramnik Variation (1.e4 c5 2.Nf3 e6 3.c4). Can someone, in simple terms, explain to me why Black's response of a forceful d5 is such