Squat all the way to the ground, touch the bar to your chest on bench presses and lock out fully, and do chin-ups all the way up and all the way down. Hypertrophy is much greater when you use a full range of motion as opposed to partial-range movements. I've been training this way since the beginning, thanks to being taught the basics from my Olympic lifting coaches. I've always done full ROM and I credit it, partly at least, with never having any serious injuries.
When you start resistance training, most of your initial increase in strength is due to a phenomenon called neural adaptation. This means that the nerves servicing the muscles change their behaviour. The nerves are thought to fire more frequently (prompting increased muscle contraction) and more motor units are recruited to perform the contraction (a motor unit is the nerve cell and its associated muscle fibres). This means you become stronger, but the muscles remain the same size – you’ve hit the plateau.
For every person who lifts weights these days, it seems there are two who have a podcast about it. There are more bodybuilding tips promising greater strength and muscle than ever before, and along with them a ton of confusion; one buffed-up Instagrammer says lifting heavy will get you swole, while a well-known fitness personality has claimed in recent years that two 30-minute workouts per week netted him 34 pounds of muscle in a month.