Train movement patterns, not muscles. Movement patterns can be broken down into 5 categories: pushing, pulling, squatting, hinging, and anti-core (see previous tip #7). These categories represent how we move on a daily basis, and any exercise you do in the gym should fit into one of them.
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For a complete day of training, choose one exercise from each of the 5 categories. If you train movement patterns you’ll inevitably train all of your muscles, but the inverse is not always true and doesn’t take advantage of how our body ‘system’ is meant to work.
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Training muscles and muscle groups (Monday: Chest, Tuesday: Back, Wednesday: Legs, etc.) has its place, but for those who want to look good naked and be healthy, training movement patterns 3-4x/week is optimal.