Before building anything, answer one question: will people pay for this?

Step 1: Talk to 10 real potential buyers

Not friends — actual people in your market. Ask what they do now about the problem and what they've paid to solve it.

Step 2: Build a one-page landing page

State the promise, who it's for, and an email signup or pre-order button. No signups = your answer before you built anything.

Step 3: Drive a little traffic

Share in relevant communities. A "like" costs nothing and means little; an email or pre-order costs something and means a lot.

Step 4: Read the signal honestly

Zero interest after real eyeballs means change the idea. Don't fall in love with the idea — fall in love with the problem.

The mistake to avoid

Building for months in secret, then launching to silence. Validate first, build second.

A tool that covers all of this: If you want landing pages, email, checkout, and course hosting in one place — with a genuinely free plan to start — Systeme.io is a solid all-in-one for solopreneurs. It's what I'd use to launch lean without stitching five tools together.