This article assumes that you know how to play blackjack. It’s more of a collection of thoughts about some more advanced topics than a structured article. But hey, have a read.
The effects of different rules / promotions on the house edge
The basic house edge against basic strategy is as follows:
One deck -0.15%
Two decks -0.35%
Four decks -0.48%
Six decks -0.48%
Eight decks -0.56%