How to build a startup.
Start with the decisions.

Most startups die of self-inflicted wounds, not competition

Building a startup is a different job from building a product. The product question is "does this work". The startup question is "can this keep going long enough to matter" — and the answers that kill companies are usually structural decisions made in the first month, casually, by people who assumed they could revisit them later. Equity splits, co-founder arrangements, what you spend before revenue, what you promise a first customer.

The order matters. There's no point optimising a funnel for a product nobody wants, and no point picking a legal structure before you know whether there's a business. But there is also a set of decisions that get dramatically more expensive to change the longer you leave them, and those deserve attention early even though they feel premature.

Idea to startup: what the gap actually consists of

Going from idea to startup is not one step, and treating it as one is why so many attempts stall at the same place. An idea is a hypothesis about someone's problem. A startup is a repeatable way to solve that problem and get paid for it. Everything between those two things is a sequence of decisions, and they have an order that most founders discover backwards.

Roughly: is there a buyer, and can you name them without using the word "everyone". What do they currently do instead, and what does that cost them. Would they pay, and how much, established before you build rather than after. What is the smallest thing that answers those questions honestly. Only then, what to build and how to reach the first ten people who might buy it.

The reason this order is worth respecting is that each answer constrains the next. Pricing decided before you know the buyer is a guess. Scope decided before pricing has no budget to fit inside. Most idea-to-startup advice hands you the steps as a checklist you can do in any order. You cannot, and the ones people skip are almost always the early ones, because they're the ones that risk a "no".

Co-founders, equity, and runway

Equity is the clearest example. Splitting it evenly on day one because the conversation is uncomfortable is the single most common structural mistake, and it's close to unfixable once someone's contribution diverges from their share. Vesting exists precisely so that a split made on incomplete information doesn't become permanent — a four-year schedule with a one-year cliff is standard, and skipping it is how founders end up with a departed co-founder holding a third of the company. The equity split calculator gives you a defensible starting point based on contribution rather than an argument.

Runway is the other number worth knowing before you need it. Runway is how many months you can operate before money runs out, and founders consistently overestimate it by forgetting that costs rise as the company does. The practical version of the question isn't "how long can I last" but "what has to be true by the time I'm down to three months, and is that achievable". Work it out with the runway calculator and revisit it whenever you add a recurring cost.

If it's SaaS, the economics are the product

Recurring-revenue businesses have a failure mode that one-off sales don't: they can look healthy while quietly dying. Signups grow, the dashboard trends up, and underneath it customers are leaving nearly as fast as they arrive. Churn compounds against you exactly the way growth compounds for you, and at 5% monthly you're replacing your entire customer base every 20 months just to stand still.

Which is why MRR and ARR are the numbers that matter rather than cumulative signups, and why the ratio between what a customer costs to acquire and what they're worth over their life decides whether the business scales or just gets more expensive. Run the CAC-to-LTV numbers on your assumptions before you build — if the ratio doesn't work on paper with generous assumptions, it won't work in reality with real ones.

Your first ten customers are research, not revenue

The first handful of customers are worth more for what they teach you than for what they pay. They tell you which feature they actually opened the product for, what nearly stopped them signing up, and what they'd have used instead. That's information you cannot get from a survey, because people are unreliable narrators of their own future behaviour — they'll tell you an idea sounds great and then never use it. The Mom Test is the standard method for asking questions that produce facts about the past instead of predictions about the future.

Get them one at a time, by hand, from wherever those people already are. Founders reliably skip this in favour of building more, because building is under your control and talking to strangers isn't. It's still the step that decides whether the next six months are spent on something real. The 9-step playbook sequences all of it, from market verdict to launch plan, and you can get a free idea score in two minutes first. Full playbooks start at $5 — see pricing.