If you're new to blackjack, then the gameplay must look very simple. But scratch the surface and you'll discover it's deceptively so. Blackjack at the casino is the one game where skills can bring the house edge down far enough into your favour that you can make steady and profitable sessions every time you play. But for this, you need a deep understanding of the card probabilities. For this, it's good to memorise a blackjack strategy chart. But you'll also need to know how to count cards.
Playing blackjack as a hobby or pastime is very different than playing as a professional. For a start, you have to make enough money to make a decent living. When you take into consideration the tiny edge the professional player has over the house, you'll need to be playing more or less non-stop to pay the monthly bills. If you want to make the transition from amateur to professional, then you'll need to learn a huge number of playing elements to help you win consistently.