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PPL is push, pull, legs or pull, push, legs (it really doesn't matter which). This will have you doing 3 workouts, 2 times per week (typically).
Push - Exercises that move things away from your body (bench press, shoulder presses, etc.)
Pull - Exercises that move things towards your body (row, curls, etc.)
Legs - Exercises that involve your legs :p (squats, lunges, etc.)
Linear progression is a principle that involves systematically and progressively increasing the resistance or weight you lift during your workouts over time. This means that you will need to add weight workout to workout, every workout as you progress.