Have a clear picture of "who will be using this product". To have a clarity here, create persona of user(who are they, their habits, how technical these people are, what they like etc.). Basically something which you can visualize and connect instantly. This will help you make faster and better decisions while designing. Saying a user "age: 25-35" is not enough, it means you do not have any real user of the product. You need to research first, "who they are".
Generally the product I build, I'm one of the users, so first persona is of myself, other two are some friends of mine who are potential user of the product.
In case you want to read more: interaction-design.org/literature/...
Thank you so much this has been very helpful for me!
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