Squat, Deadlift, Press
https://www.nifs.org/blog/powerbuilding-the-middle-ground-be...
Edit: for a balanced approach, the Youtuber Jujimufu is a great watch. He's a bodybuilder who also does acrobatics and competes in powerlifting, and will often spring a backflip after a really impressive lift (https://youtu.be/_ydPYzYCpgU). Truly impressive.
Once weekly: Squat, Press, Deadlift.
This has done wonders for my back, especially my upper back, and my posture.