The optimal basic strategy for Blackjack involves making decisions based on your hand total and the dealer's upcard. If your hand is 17 or higher, you should always stand. For totals between 12 and 16, stand when the dealer shows a weak card (2-6) but hit if the dealer has a stronger card (7 or higher). If your total is 11 or lower, you should generally hit, but double down on 10 or 11 when the dealer has a weaker upcard. For pairs, always split Aces and 8s, never split 10s or face cards, and split smaller pairs like 2s, 3s, 6s, and 7s when the dealer shows a weak card. If surrendering is an option, it’s advisable to surrender a hard 16 against a dealer's 9, 10, or Ace, and a hard 15 against a dealer’s 10. This strategy minimizes the house edge and maximizes your chances of success.