These charts are for the single deck version of Blackjack. The multi-deck version can be found here.
Single-Deck Blackjack is not as common as it’s counterpart multi-deck blackjack but you can still find the game played in American casinos in particular Las Vegas it requires frequent shuffling by the dealer and attracts card counters as single [...]

The charts below are for blackjack games using that use four to eight decks of cards and where the dealer stands on soft 17 and double downs after splitting a hand is allowed. For single deck blackjack basic strategy chart.
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In order for card counting to be profitable the player must bet according to the true count. If the true count is negative or neutral, the player should bet small. The chances of the Dealer achieving a good total are greater at this stage, so betting small minimizes the losses. When the true count [...]

Differences between Spanish blackjack (21) and Regular Blackjack
Spanish blackjack (21) is a simple variation of regular Blackjack but with several additional options, features and bonus payouts. It is dealt in much the same manner as regular Blackjack and the majority of the Blackjack procedures also apply to Spanish blackjack.