How did the Red Army win the Russian Civil War?

Hey all,

I'll be honest that I have no idea how the Bolsheviks won the war considering the Red Army was newly formed, had no funding, WWI had already destroyed the countryside and led to millions of deaths, the White Army possessed most loyal and experienced top military from the former Russian Empire, the 13 most powerful and wealthiest empires and countries in history invaded on behalf of the Whites, rogue leftist anti-Bolshevik armies and gangs formed, sabotage and counter-revolution, etc. It seemed like the Red Army was fighting on every single possible front for the mere existence of the fledgling socialist nation.

So how did they win? Out of all this chaos how did the Bolsheviks retain power and, ultimately, were able form soviet republics across the former Russian Empire? I genuinely do not understand.

Of course I'm glad they won, but can an understanding of why and how they won still be illustrative to modern movements? Not in terms of copying all tactics, the Bolsheviks had to contend with their particular material conditions which led to their particular approaches, but rather in any underlying ethos or ideological tendency in building and maintaining power after the initial revolution which can be helpful to future and contemporary revolutionaries?

Also any good book recommendations would be helpful too!