Literature says you can gain strength doing 3-20 reps, as little as 2-3 sets per week. AKA it's all over the place as long as you're progressive overloading and getting stronger. Some people respond better to some stimulus than others, and sometimes you change stimulus to progress. Some exercises feel bad for some people. You don't know where you fall on the genetic bell curve unless you try to figure out what works for you. Ultimately it's about knowing the basics of strength programming being able to manage stimulus/fatigue and applying it to yourself so you can progress - ONLY if you want to progress. At some point it becomes a lot of work / you hit genetic ceiling at specific bodyweight. Also need to figure out what you're training for, if you're an old man and just want to keep a baseline level of fitness and avoid injury etc, i.e. NASA routine for ISS is like 5 sets of 10s-20s with pretty modest weight because they just want to maintain muscle mass and avoid injury at all cost.
I'm a big fan of double progression + RPE / RIR (rate of percieved exercion / repititions in reserve) for people who don't want to bother with percentages and complicated training cycles and platemath. You do 2-4 sets of an compound exercise with a setXrep goal in mind, i.e. 3x8 on bench with 135lbs. you start with 3x5, then add 1 rep to 1 set, i.e. 5/5/5 then 6/5/5 then 6/6/5 until you get to 8/8/8 with a RPE/RIR in mind, where RPE/RIR is how many reps you can still do after that set. Usually you start with 2-3 RIR = you pick weight you where you can do 8 reps but only do 5 (3 reps in reserve), and maybe at the end of the cycle you can do all 8 reps but still feel you can do another 2, so theoretically you went from 8 rep max to 10 rep max. Then add 5/10lbs and repeat. It's slow, it's boring, but it's simple, it's systematic and works pretty well, since +1 rep means you're always accumulating more volume each session until you reach the end where build up to doing 40% more volume/work @3x8 vs @3x5, and then you reset back to 3x5 and ramp up at a slightly higher baseline with slightly mroe weight.
I'm a big fan of double progression + RPE / RIR (rate of percieved exercion / repititions in reserve) for people who don't want to bother with percentages and complicated training cycles and platemath. You do 2-4 sets of an compound exercise with a setXrep goal in mind, i.e. 3x8 on bench with 135lbs. you start with 3x5, then add 1 rep to 1 set, i.e. 5/5/5 then 6/5/5 then 6/6/5 until you get to 8/8/8 with a RPE/RIR in mind, where RPE/RIR is how many reps you can still do after that set. Usually you start with 2-3 RIR = you pick weight you where you can do 8 reps but only do 5 (3 reps in reserve), and maybe at the end of the cycle you can do all 8 reps but still feel you can do another 2, so theoretically you went from 8 rep max to 10 rep max. Then add 5/10lbs and repeat. It's slow, it's boring, but it's simple, it's systematic and works pretty well, since +1 rep means you're always accumulating more volume each session until you reach the end where build up to doing 40% more volume/work @3x8 vs @3x5, and then you reset back to 3x5 and ramp up at a slightly higher baseline with slightly mroe weight.