Build systems not features

When you build a feature, some time it is something small that doesn't affect the rest of the application so you can just take the Trello task and implement it.

But most of the time you're building things inside a bigger project.

So before developing that feature, make sure you try to understand how the system works.

Be an architect for a while, before doing the coding.

Sketch your ideas, double check existing code and database structure.

Only then do the coding.