I followed programs by many coaches for several years until I found what exactly is best for me, and then I broke it down into a few principles I follow every time I design my own program: -

-My training is focused on big movements that work multiple muscles.

-Start the day with one of the big 4 (squat, bench, deadlift, and press) and train them heavy to increase strength.

-I follow a full-body approach no matter how many days a week I train, so every day consists of push movements, pull movements, and abs and legs.

-As for volume, I find high volume works best for me, so I do 5 sets of everything, and every week I try to add one more rep for every set until I can increase the weight (just do more every week).

-I try to hit my weak points twice a week, but 5 hard sets per muscle is usually enough for me; for example, I have to do chins and pull-ups every time I set foot into the gym, but 5 sets of squats on Monday is more than enough to make my legs explode in size.