I want to learn what the main muscle groups are for training in the gym. Please also clarify any main muscle groups that are generally worked together.
The main muscle groups for training in the gym are:

Chest: Pectoral muscles
Back: Latissimus dorsi, rhomboids, trapezius, and erector spinae muscles
Legs: Quadriceps, hamstrings, calf muscles
Arms: Biceps, triceps, forearms
Shoulders: Deltoids, rotator cuff
Abdominals: Rectus abdominis, obliques, transverse abdominis

Muscles that are commonly trained together:

Chest and triceps: Triceps are worked when doing chest presses.
Biceps and back: Biceps are worked when doing pull-ups and back exercises.
Legs and glutes: Glutes are worked when doing squats and deadlifts.
Shoulders and abs: Abs are worked when doing overhead presses.
Is it ok if I train chest and biceps together more often?