Great video on why heavier weights and "progression at all costs" isn't always better for getting stronger.
The first thing my coach had me do when I started with him was to take weight of the bar in order to lift every rep with better technique. Haven't missed a rep in training since and I think it makes a lot of difference in the long run.
Also good tip to look at the Russians and how they train. Average intensity in the Sheiko programs is 67% iirc, which I belive is significantly lower than Stronglifts or whatever 3x5 / 5x5 where you are quickly lifting over 80%.