Hesre is a simple system of " double progression"
Pick an arbitrary figure
8 to 12
Pick an arbitrary weight
50 kg
Pick an arbitrary number of sets
Two
Over a period of months from one workout to the next, it should look like this;
50 x 10, 9
50 x 12, 10
50 x 12, 11
50 x 13, 12
50 x 13, 12
55 x 10, 10
55 x 11, 11
55 x 12, 12
60 x 10, 8
60 x 11, 9
60 x 11, 9
60 x 11, 9
65 x 9, 8
More often than not an increase in weight can stimulate growth
65 x 9, 9
65 x 10, 9
65 x 10, 10
65 x 11, 9
And so-on, as long as you see progress and your rep's are similar and controlled (good form) results will be amazing and your training life will be long and cosistant.