Whole books have been written on the subject of periodization for strength training. The essence seems to be to work in different rep ranges. 5 or less for strength and 8-12 for hypertrophy.
A simple periodization scheme may be: the first week do 3 sets x 4 reps. The next week 3 sets x 6 reps. And so on up to 12 reps. Then go back to 3 sets x 4 reps.
Even this I find overly complex. Instead I like to vary the rep range within each workout. One workout I may do 3 sets of 10, 5 and 10 reps. Another workout I may do 3 sets of 5, 5, and 10 reps.
Are there any drawbacks with this approach compared to more "proper periodization"?
My goals are a mix of strength and hypertrophy. I have trained for about a year.