Of course hand washing/sanitzing. I take a daily multivitamin, get enough sleep, don’t smoke (that’s all the time, but especially during flu season), avoid people who are sick, and get the flu vaccine.
Definatley washing your hands reguarly also you should try taking some natural products that help boost the immune system, keep warm, meake sure you eat right drink plenty of fluids, if you find that you have got it (which just about everyone does no matter what you do) then nip it in the butt straight away
Hope this helps
Hand washing- Conscientiously washing your hands after exposure to anyone with a cold will reduce your chances of being infected.
Hydrate- Drink plenty of fluids. Your body loses fluid as a result of fever that may accompany an infection. Cold viruses cause your body to produce excess phlegm, and drinking water will help keep that phlegm from thickening and drying out.
Heat- A fever is nature’s way of making your body inhospitable to intruders, so resting in bed and staying warm with blankets can help Mother Nature help you.
Also there is always the influenza vaccine shot.