What do you think is the most important part of creating a successful product?

Audience. Whatever you product is be obsessed in building an audience.

Customer feedback early on. Have 100-300 conversations with "stakeholders" before touching a line of code!

A wildly successful product must have these three things: 1) It should be something that solves a problem or fills an existing need 2) It should be extremely easy to use 3) It should provide clear benefits over available alternatives. If you can get all three of these things into your product, you will likely have a successful product.

Audience Demand Uniqueness

In my opinion, the most crucial part of creating a successful product is finding a real concise market need. Just because you are passionate about something doesn't mean it will sell. As you know, there are thousands of books on how to write a novel, but only a handful of them sell. That's because not everyone has a burning desire to learn how to write, but they want to be an author. So you need to find a market need and fill this need. Of course, even after finding this market need, you still need to master your skill and expertise to create a successful product.

Understanding the pain points of your customer is the most important part man. Some of the rest are researching on the current competitors, reducing cash burn rate by optimizing the process with micro improvements.

A successful product adds value to a customer's life. I have been working on a startup, and this is the most common issue we have got.  We need to know what customer needs and not what the tech team thinks. So if you are working on a startup, look at the problem solved by you and believe how it will change people's lives. Then decide the features and product from there.

The group of individuals working to launch a product is, in my opinion, what makes it successful. For instance, the same game developers assemble a group of like-minded individuals to develop the game (game code, game levels, design with details of everything you need for the game, music, voice). When all of these components have been created, the next process is to form a team of testers for a closed beta test. During this phase, they assess the game and its design and look for any alleged game flaws, which the developers then repair before releasing the final product. And at the conclusion of this high-quality advertising game, in which the advertising will be seen by many people, everything will depend on the group that develops the product.

- Team building it and their passion - Taking non-emotional, rationale and hard decisions when the business requires it

I think that there is not only one thing that can help you achieve success with your product. It's a combination of hundreds of different things. Imo, web design is a key factor to make the right first impression to your audience. And it's really easy to create it, because there are so many affordable graphic design tools, like Figma, Sketch, Lunacy for creating cool web design ;)