Know Your Market

The most expensive mistake in go-to-market is the most tempting one: trying to sell to everyone. "Our market is anyone who needs X" feels ambitious, but it's a recipe for a message that resonates with no one, a product spread too thin, and marketing spend sprayed at people who'll never buy. The counterintuitive truth is that the way to a big market is through a small, specific one — and defining that specific one is the first real work of GTM.

By Pratik Dhanave · August 20, 2026 · 7 min read

#Go-to-Market #Business Strategy #Startups #Marketing

Every downstream GTM decision — positioning, motion, pricing, channels — depends on one thing: who you’re selling to. This post covers defining your market and customer: segmentation, the ideal customer profile, targeting, sizing the market (TAM/SAM/SOM), and the power of starting with a focused beachhead. Getting the who right is the foundation; getting it wrong makes everything else wrong, no matter how well executed.

Why “everyone” is not a market

The instinct — especially with a genuinely useful product — is to define the market broadly: “anyone could use this.” This feels like maximizing opportunity, but it backfires:

A message for everyone resonates with no one. To compel someone to buy, your message must speak directly to their specific problem in their language. A message broad enough to fit everyone is generic enough to move no one — it can’t name a specific pain or promise a specific outcome. Specificity is what makes value land.
You can’t reach “everyone” efficiently. Different customer groups gather in different places, respond to different channels, and buy in different ways. “Everyone” has no common watering hole, so marketing to them is unfocused and wasteful. A defined segment can be reached deliberately.
The product gets spread thin. Serving every possible user means building for conflicting needs and pleasing no one deeply. A focused customer lets you build something excellent for them rather than mediocre for all.

So “everyone” isn’t a market — it’s the absence of a market decision. The first discipline of GTM is choosing who you serve, which means choosing who you don’t. That feels like giving up opportunity but is actually how you create the focus that wins. This is the hardest and most important shift: from “who could use this?” to “who is this for?”

Segmentation and the ideal customer profile

The tool for this is segmentation — dividing the broad market into distinct groups with shared characteristics and needs — and then choosing which segment(s) to serve. You can segment along many dimensions:

For businesses (B2B): industry, company size, role/department, the specific problem they have, their technical maturity, how they buy.
For consumers (B2C): demographics, behaviors, needs, willingness to pay, context of use.

The goal is to find segments that are distinct (they have meaningfully different needs or buying behavior) and actionable (you can identify and reach them). From your best segment(s), you define an ideal customer profile (ICP) — a precise description of the customer you serve best:

The ICP is your best-fit customer, described concretely. For B2B: what kind of company (industry, size, situation), which buyer and user (role, goals), what problem they have that you solve especially well, and why they’re a great fit. For B2C: the specific person, their situation, and their need.
It’s who you’re for, and implicitly who you’re not for. A good ICP is specific enough to exclude people — and that exclusion is a feature. It focuses your product, message, and spend on the customers most likely to buy, succeed, and stay.
It comes from evidence, not imagination. The ICP should emerge from talking to real customers and observing who actually gets the most value and buys most readily — not from a whiteboard guess. Your best existing (or prospective) customers reveal your ICP.

Segmentation and the ICP turn “the market” into a specific, reachable, buildable-for target. Everything downstream — how you position, where you market, how you sell, what you charge — is calibrated to this profile. Get the ICP right and the rest of GTM has a foundation; get it wrong and you optimize everything toward the wrong people.

Sizing the market: TAM, SAM, SOM

Once you know who you serve, you need a sense of how big the opportunity is — both to judge whether it’s worth pursuing and (if raising money) to show investors the potential. The standard framing is three nested sizes:

TAM (Total Addressable Market) — the total demand if you sold to everyone who could conceivably use a product like yours. The whole universe.
SAM (Serviceable Addressable Market) — the portion of the TAM you could actually serve given your product, focus, and geography — the segment you target.
SOM (Serviceable Obtainable Market) — the realistic share of the SAM you can actually win in the near term, given competition and your capacity.

   TAM  — everyone who could ever use something like this
    └── SAM — the segment you actually target and can serve
          └── SOM — the slice you can realistically win now

The point of TAM/SAM/SOM isn’t false precision (these are estimates) but discipline: it forces you to distinguish the dream (TAM) from the target (SAM) from the near-term reality (SOM), and to check that your obtainable market is big enough to matter. A common error is quoting a huge TAM as if it were the real opportunity; the SAM and SOM are what you actually pursue. Sizing keeps GTM grounded in a real, reachable opportunity rather than a fantasy of “everyone.”

Start with a beachhead

The strategic payoff of all this focus is the beachhead: rather than attacking a broad market at once, you win a small, specific segment completely, then expand from that base of strength. This is one of the most reliable GTM patterns:

Dominate a niche first. Pick a narrow segment where your product is a must-have (not a nice-to-have), and win it decisively — become the obvious choice for that specific customer. A small market you own beats a large market where you’re one of many unknowns.
Why it works. Winning a focused segment gives you real customers, references, revenue, product-market fit, and a clear message — assets you then leverage to expand into adjacent segments. Each expansion is easier because you’re moving from strength (proven value, happy customers, credibility) rather than starting cold everywhere.
The famous framing. This “start narrow, then expand” logic underlies the classic Crossing the Chasm idea (a later post revisits it for adoption): win a beachhead segment, use it as a base, and expand outward — like an invasion establishing a foothold before advancing. Trying to take the whole market at once, by contrast, spreads you too thin to win anywhere.

The beachhead reframes focus from a limitation into a strategy: you go small on purpose, to go big eventually. The narrow ICP and segment you chose become the foothold from which you grow. This is why “who’s it for?” answered narrowly is not settling — it’s the fastest path to a large market.

Knowing your market means rejecting “everyone,” segmenting the market, defining a precise ideal customer profile from real evidence, sizing the opportunity honestly (TAM/SAM/SOM), and starting with a focused beachhead you can win completely. It’s the foundation every other GTM decision rests on. Next: positioning and messaging — how you define what you are and make your value land with that customer.

Key takeaways

“Everyone” is not a market — it’s the absence of a market decision: a message broad enough for everyone moves no one, “everyone” can’t be reached efficiently, and serving all needs spreads the product thin; the first GTM discipline is choosing who you serve (and who you don’t).
Segmentation divides the market into distinct, actionable groups, from which you define an ideal customer profile (ICP) — a concrete description of your best-fit customer (their situation, the buyer/user, the problem you solve especially well) that comes from real customer evidence, not imagination, and implicitly says who you’re not for.
Size the opportunity with TAM (everyone who could use it) / SAM (the segment you target and can serve) / SOM (the slice you can realistically win now) — for discipline, not false precision, distinguishing the dream from the target from the near-term reality and checking the obtainable market is big enough.
Start with a beachhead: win a narrow segment completely (where you’re a must-have), then expand from that base of strength — real customers, references, revenue, and a proven message make each expansion easier than starting cold everywhere.
Focus is a strategy, not a limitation: going narrow on purpose (a specific ICP and beachhead) is the fastest path to a large market, and getting the who right is the foundation every downstream GTM decision (positioning, motion, pricing, channels) depends on.