I've spent years studying what separates founders who make it from the ones who quit after 6 months. Here are the patterns I keep seeing:

1. Building before validating. Most people spend months building a product nobody asked for. Talk to 20 potential customers before writing a single line of code.

2. Pricing too low. If your product solves a real problem, charge what it's worth. Underpricing signals low value and kills your margins.

3. Trying to do everything alone. You don't need a co-founder, but you need a community. Surround yourself with people who are 2 steps ahead of you.

4. Ignoring distribution. The best product in the world means nothing if nobody knows it exists. Spend 50% of your time on distribution, minimum.

5. Giving up at the wrong time. Most founders quit right before the inflection point. If you have paying customers and they love you, keep going. If you don't, pivot faster.

Which one hit hardest? Drop it in the comments.