Thank you very much means a lot to me
A drop set is once your doing your working set you drop the weight as soon as you reach failure and move straight away on to the set again with less weight until failure is reached again, if possible you could add in a further 2nd drop set and repeat again. But I wouldn't rest 30-45 seconds between drop sets because than a version of a rest pause method which is different but still productive.
The first thing you need to learn how to attack and perform is failure before you start going into dropsets, rest pause, negatives and forced. Failure is very hard to do and you cant just do it and it takes time for you to train your body to go into this zone, what you think failure is probably isn't.
Remember going to true positive failure like I've describe previously hits the toughest muscle fibers what grow the biggest these are the fast twitch type 2b fibers, you hit these fibers and you will have the biggest chance of increasing in size. What we are aiming for is progression overload so you keep hitting the muscles with an increased weight so they need to change and adapt to the overload its being put under. This kind of continuous stress will have a reaction on the body and it will have no other alternative but to grow. We keep within the right rep range what stimulates the biggest growth and we continuously try and increase the intensity by increasing the reps then once the reps increase you increase the weight to bring the reps down within the correct range again. I can't stress enough about taking your muscle to true positive failure, this takes a lot of mental preparation. Once you hit failure these fibers starts to be stimulated and this is when most people stop the working set, with HIT you go to failure or beyond but learning to go to failure is first and this can take months even years to train yourself to do