How to keep my hair looking good the whole day? I'm a guy?

Find less greasy products. Neutrogena is a good shampoo and you might want to forget conditioner all togather. Use something like hair spray when you comb and dry it. If you dye it that might help and give it a glossy look. Leave The parts you dont like slightly longer when you get a haircut and add layers to those spots with a small pair of scissors. You might not want to comb some spots because it will increase hold and volume in those areas.