If you are in your twenties, read Starting Strength [1].

If you are in your fifties, read both Starting Strength and The Barbell Prescription [2].

[1] https://www.amazon.com/Starting-Strength-Basic-Barbell-Train... [2] https://www.amazon.com/Barbell-Prescription-Strength-Trainin...

Stronglifts is a good beginner program, but people over 40 would benefit from reducing the volume (e.g. going from 5x5 to 3x5), as it becomes too much when the weights grow larger.

If you are over 35 (and sedentary), I'd really recommend reading "The Barbell Prescription" https://www.amazon.com/Barbell-Prescription-Strength-Trainin... — it will be a much better guide than most advice available online, which seems to be directed at youngsters.