Various exercise methods have been developed to try to obtain a training edge. There are hits, misses and those that lie somewhere in-between.
Concentric and eccentric actions defined. If done safely eccentric (or negative) training has its benefits, but it can take time before you see results.
Time under tension or rep tempo is crucial but experience is required to make sense of some poor research into super slow tempo training.
Taking your sets to failure is popular, but if you’re in it for the long run finding that sweet spot and then dialing it up and down is best.
Doing partial rep training or forced rep training with intelligent consideration requires understanding the strength curve of the exercise you want to do.