My answer is simple.
To keep your hair groomed, you need at least three products, minimum: shampoo, conditioner, and one of four hair products: grooming cream, pomade, styling paste, or matted putty.
Here are a few that I enjoy using at the moment..
Choose one! _______
Grooming Cream – Grooming Cream by American Crew
Pomade – Matte by John Allan
Styling Paste – Shape Paste by Shu Uemura
Matted Putty – Sumotech by Bumble & bumble