When it comes to the house edge in blackjack, it's important to understand that it isn't a fixed number that applies universally to all casinos and variations of blackjack. Several factors influence the house edge in a game of blackjack, including the strategy you employ, the specific variant of the game, the number of decks used, and even the casino you choose to play at. The typical house edge that players come across is around 2% (if you play perfectly). This can vary between 0.5% and 4%.
When playing blackjack, it's crucial not to assume anything about the house edge of the variant you're playing. Take time to learn and understand the house edge and then tailor your blackjack strategy accordingly if you want to minimize your losses. Additionally, employing mathematically sound strategies during gameplay can assist in reducing the house edge. Therefore, I highly recommend familiarizing yourself with strategies for the benefit of your wallet.