As a beginner you will get results from exposing yourself to lifting. After a period of time you will then experience what is know as a plateau. This is where you find yourself stuck with the same result from the time and work you are putting into your workouts.

The solution to this is by introducing progressive overload. This is where you perform more than you did on your previous session with a mixture of reps on different days all channelled towards the goal of increasing the weight and reps performed over the weeks, months and years of training. This is how you build muscle, strength, fitness and burn fat.