1) Writing Code Without Planning
The Mistakes I Made As a Beginner Programmer
Samer Buna
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0) Being Crystal Clear About The Business Need

This isn’t only important to the developer(s), but also the business entity making the request.

Clients are notorious for piling up a list of wants and in the end that noise misses the actual needs. Repeat after me :)

“Wants are not needs.”

The Five Why’s, if you’re not already familiar, is a great tool for gaining clarity.

http://5xy.co/

p.s. FWIW, even seasoned vets too often jump in before the actual and true needs are defined.