When establishing a skincare routine, trust KISS — short for "keep it simple, stupid" — a '60s-era design principle established by the US Navy. No, that doesn't mean you should opt for the all-in-one product you find populating the men's aisles in chain retailers.

Instead, it means limiting the steps you take to protect and replenish your skin to the bare minimum. Why? Because as easy as it can be to adopt a new product as soon as it catches your eye, or promises specific results, you're likely overspending on something superfluous. That being said, reducing your product inventory down to the equivalent of dish soap for the sake of being frugal doesn't cut either.

Skincare doesn't have to be a complex task only celebrities prove capable of mastering (with the help of some grooming guru no one else can afford). Anyone can establish a basic skincare routine, and not only will one improve your overall appearance, but it'll address lingering, or worryingly recent, issues like wrinkles and acne and damage done by sun exposure.

According to Dr. Jeremy Fenton — Medical Director for Midtown Manhattan's Schweiger Dermatology Group and winner of the Marion B. Sulzberger Award for Excellence in Dermatology — there's a defined order of importance and optionality, steps you shouldn't skip and products you can avoid altogether (if you want). "These are your basic components," he says. "With them you're covering 95 percent of what you need."

The Routine

These are the five steps to a complete skincare routine.

Step 1: Wash Your Face

"You're going to do this twice a day — morning and night. I generally recommend some sort of gentle skin cleanser. You don't want something that's going to strip the oils away or is overly harsh. What you choose is going to depend on what your skin type is like." Guess what? You're in luck. Here are handy guides for every type of skin. Choose yours below.

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Step 2: Moisturize

"You don't really need to buy a fancy or super expensive moisturizer," Dr. Fenton says. "Most dermatologists, myself included, obviously, say that some of the basic brands — like Cetaphil, which you can pick up at any at any drugstore — are sufficient as moisturizers." Although luxurious little vials can be tempting, trust the accessible, dermatologist-approved classics.

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Step 3: Apply Sunscreen

"The most important thing that's going to make the biggest difference, in the long run, is putting a sunscreen on every day," he says. "Underestimating the importance of sunscreen is a common mistake." Listen to the man!

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Step 4: Rewind With Retinol

"If you're looking for anti-aging and to get glowing skin, then you would add in a retinol, which is over the counter, or prescription-strength retinoid," Dr. Fenton says. However, be mindful of both how much you're using and how often you're using it.

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Step 5: Add an Antioxidant Serum

"If you're going to add something else on top as a protective function, then you could add in an antioxidant serum," he says. These penetrate deeper than moisturizers to address dryness in all of the skin's layers.

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The Appointment-Only Tips

These are the extras you'd get from an extended visit.

Toss Your Toner

"That is the most commonly used product that I tell people they could eliminate and probably not lose anything," Dr. Fenton says. Using one won't do any harm, but he says you don't need it.

Don't Max Out On Moisturizers

"If you're going to spend the money, where you want to spend it is in the retinol and antioxidant categories," he says. "That's where different brands have different qualities and can set themselves apart." Welcome to skin money management 101.

man applying skin care product to his face
Sephora

Start Light

As far as order of application goes, Dr. Fenton says start with the lightest product. "As a general rule of thumb, we tell men to apply whatever product is thickest last, unless it's a medicated product that you want directly on the skin."

Too Clean Is Too Far

"Too many people think they need to be stripping their skin of all of its oil in order to get it clean," he says. "If you strip all of the oil off of your skin, you're going to create an imbalance and end up doing more harm than good." Our collective hygiene's at an all-time high, but heed caution with the facial cleansers.

Always Use Sunscreen

"You don't just put it on when you go to the beach or when you're going to be outside," Dr. Fenton says. "If you're going to be spending money, and doing all this other stuff, focus on putting your sunscreen on first." Commuting? Put it on. Walking the dog? Put it on. Working by a window? Put it on. Going to the pool? Definitely put it on.