What is the most important thing about building a startup?

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Tell yourself, Be consistent, . Try not to k=get yourself confused by other's letting you down. Be focused towards your idea.

Understanding the market and solving a real problem is crucial for building a successful startup. Knowing what customers need helps create a valuable product or service.

If you're starting with zero prospective clients marketing/outreach is huge. I worked with one startup that was set up to go from nothing to 500k contracts with just a client or two. However, learning how to identify those clients and develop effective outreach was a struggle.

believe in yourself and be consistent with it. consistency is the most important factor

How about: paying customers? A startup is not an ego trip, but the attempt to build a business.