Theoretical probability is what the maths predicts before you start: a coin should land heads 1/2 of the time. Experimental probability is what actually happens when you run the trials: successes divided by total trials.
At small trial counts the experimental value is wild and noisy. As the number of trials grows, it settles closer and closer to the theoretical value. That is the law of large numbers, and it is the whole point of this lab. You cannot flip a coin 100,000 times by hand, so buy machines that do it for you and watch the blue line lock onto the orange one.
Independent events: the two-dice experiments connect to the last unit. A streak of one result does not make the other one "due." Each trial stands alone.