I've been in the SEO game long enough to see founders burn through months of work on a product nobody finds. If you're launching your first business tomorrow, here's the one piece of advice I'd give: distribution beats product every time. A slightly worse product with great distribution wins over a masterpiece nobody ever sees.
I've seen colleagues learn this the hard way. They build for six months, then realise they can't sell. My process? Validate before building. Learn to sell without a product. Build 5%, validate, build another 5%, validate again. Customers often say they like an idea but won't pay for it. You need to find the thing people will actually pay for.
The original discussion had a few common refrains: sell first, validate constantly, and expect distribution to be the hardest part. So my question to you founders out there: what's the one mistake you wish you'd avoided? I'm all ears.