Took me years of injuries etc to come to this. im a bit stubborn and had to work it out the hard way before I learnt what I was told by people older/bigger/stronger than me.
Nothing new or groundbreaking here. Just reiterating what EVERYONE told me and I ignored.
Just my opinion here.
1. Cycle weights with progression
You need to go back and "lernt" some more.
This means absolutely nothing. The weight you choose will be determined my your weak mind. What does that even mean anyway?
2. Training faster is much better - obvioously a point of dimishing returns but I can get my workouts right down to 1hr 15mins now MAX
To a rookie, 1 hour and 15 minutes is considered "fast."
3. 8-12 reps IN GENERAL is better. Much easier on the joints, builds more muscle more fun and better pumps. Easy to get stronger also
Your joints maybe. But real men should train heavier if they can handle it to maximize THEIR muscle building potential. 12 reps is a lot of reps in a set. You can lift much heavier doing fewer reps in a set.
By the way, "pumps" were sold to you by the supplement companies. They have nothing to do with the quality of a workout. You mean to tell me that you've never had a great workout without a pump?
4. Pick a few basic exercises and get good at them. Bench, squat, deadlift, chin, dip, row and press. All you need. Add in a few others also.
5. Protein is essential - I bumped up protein consumption and got bigger.
6. Leave your ego at the door - After my first 1 or 2 exercises I am wrecked and using bitch weights - getting better workout though and its easier to progress.
Meaningless, non useful advice. What's bitch weight to one person is not the same to another.
7. Use full and perfect ROM.
Silly advice that all rookies believe. Do you ever notice the top pros do not use perfect form or full ROM?
Oh yeah, you rookies thinks it because of the DRUGS.

8. Certain rep ranges work better for certain people - find and exploit what works for you.
more non useful advice. If people have to use their own judgment of what work, the "bell curve" of the very good, average, and those who sucks will stay exactly the same. The average and those who suck CAN'T and should NOT use their own judgment.
Flame away if you wish or add to it.
Other that that, it's okay. I'll give you a C+