Generally try to increase the weights pretty often. In the beginning and depending on the exercise (potentially larger increases on the lower body exercises) you can go with bigger steps (-5 kg), but later you’d want to probably increase the load minimally (1-2,5 kg).
Example – one workout you do 12 reps with x kg and in the next one you do x+2,5 kg for 10-12 reps.
Another option of progressing is adding reps. Especially with exercises which plateau quicker, where you couldn’t increase the weight any more using the same rep number (for example certain upper body exercises).
Example – one workout you do 10 reps with x kg weight and in the next you do 11 or 12 with the same weight.
Since the primary goal is to get stronger then you’d want to mostly prefer increasing weights to increasing reps.
Combining both progression options is also good, while still leaning more towards increasing weights.
Different exercises can also have different progression models.