To start, it is better to choose slots with transparent mathematics. An easy interface and low or medium volatility. These machines pay out winnings more often and allow you to calmly understand the mechanics. I personally started with two fantastic, casual online slots-style games: Easter Luck, a bright and simple slot with a nice atmosphere, and Totem Mystique, which has clear bonus features, even for beginners. They are cool for evening relaxation and don't use up coins after a couple of spins. And what themes do you like more: something mystical and adventurous or classic?