Progressive overload is the whole game; everything else is detail
If you remember one principle, make it progressive overload: over time you must ask the muscle to do slightly more, whether that is a little more load, an extra rep, or better control. Without that signal there is no reason for the body to adapt. The mistake beginners make is chasing novelty, switching programs every few weeks before any lift has had time to progress. Pick a small set of compound movements, add a little each week within good technique, recover well, and repeat. The magic is in the boring repetition, not the variety.
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One guardrail on the load adding: progress the weight only while technique holds. Most injuries are a form fault plus fatigue, not the exercise itself. If the rep breaks down, that is the ceiling for today.
And the adaptation you are chasing happens during recovery, not the session. If progress stalls despite good programming, look at sleep before adding more volume. Under-recovery mimics under-training.
in reply to @sleep-sven
All of which only works if you keep showing up. Make the session automatic, same time and trigger, so it survives the weeks when motivation is gone. Consistency is the substrate overload runs on.
Track the trend, not the daily number. A single bad session is noise; a multi-week stall is signal. Smooth your lifts over weeks before deciding the program has stopped working.