Question: How do reps, sets, and Time under Tension work?

So I'm sort of new to weight lifting and haven't figured out every nuance yet. Say I start my bench with (don't laugh) 70 lbs, including the bar, doing 8 or so reps. Then I move up to 80 lbs and 5ish reps. When my dad comes and helps, I load all the weight onto the bar that I can (~100 lbs) but can only do 1 rep... not even a whole rep really he plays a big part in putting the bar back up, and I do that 4 or 5 times til I'm exhausted. Could I just max out the weight I'm lifting and do fewer sets but still get results, or is it important to work different weights/reps? Thanks in advance! P.S. - I always start with a warm-up set but almost never stretch. Is that bad?







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