Building some strength for golf using some basic movement patterns. Having a basic foundation of strength is important for golf and general life. The exercises in the video are aimed for those who are new to weights/resistance/strength training.
Using the same weight and reps/sets all the time, won't lead to any improvements in strength and/or performance.
Below is an example of linear periodisation.
Month 1- Perform 2-3 sets of 12-15 reps (as a basic starting point) whilst looking to keep good form and to progress/increase the weight. Month 2- look to increase the load/weight and reduce the Reps, using 3 sets of 10-12. Month 3- follow the same pattern and increase the weight whilst reducing the reps. i.e. 3-4 sets of 8-10. Particularly during month three, you may have to use other variations of the exercises in the video (for example goblet squat to back squat) in order to continue progressing.
Using the exercises and sets and reps above, you can aim to progressively overload (increase the load/weight used) over time.