It's actually pretty damn simple logic. If you want to lift heavier weight, then you need to lift heavier weight. If you want bigger muscles, then lift as much total volume as you can in the least amount of time (which works out to sets of 8-12). If you want to be good at endurance sports, then do endurance training.
This stuff isn't rocket science. I know the fitness industry has been blasting bullshit at all of us for decades, but throw all that out the window. For the most part, simple logic prevails when it comes to lifting, especially as a beginner.