What weight dumbbells should I consider using as a male individual, particularly when navigating the nuanced landscape of strength training? Is there a specific kilogram range that would be more beneficial for someone just starting their fitness journey, or perhaps a more seasoned individual seeking to augment their muscle mass? Should I prioritize lighter weights to master proper form before progressing to heavier options, or is it imperative to select a weight that immediately challenges my muscles to stimulate hypertrophy? Furthermore, how does my body composition, fitness goals, and overall strength level influence the choice of dumbbell weight? Are there particular exercises or routines where certain weights might be more advantageous for developing strength or endurance? In the realm of fitness, how crucial is it to periodically reassess and adjust the dumbbell weights as I evolve in my training? Could professional guidance play a pivotal role in this deliberation?