Yes, there are several special rules depending on where you’re playing from as well as different variations found within some specific websites or games themselves.
Generally speaking though, some common rules you should be aware of include insurance bets (which allow you to bet against the house if they have an Ace); splitting (which lets you split identical cards into separate hands); doubling down (which allows you double your original bet after receiving your first two cards); surrendering (which lets you forfeit half of your wager if necessary); and dealer standing/hitting soft 17 (which means whether or not a dealer will draw another card if they have an Ace).
Be sure to read up on all special rules before beginning play so that you know exactly what’s expected!Blackjack is a game of skill, and the more you practice and develop your strategies, the more success you’ll have.