A broad but fascinating question! Here's what research and philosophy say about what makes things better:
What Makes Things Better
1. Improvement in Function or Performance
Something gets better when it does its job more effectively - a faster engine, a clearer explanation, a more reliable tool. The core is: does it achieve its purpose with less friction?
2. Reduction of Harm or Suffering
In ethics and medicine, "better" often means reducing pain, risk, or negative outcomes. Less damage, fewer side effects, lower costs.
3. Increased Value or Meaning
Philosophers (Aristotle, Mill, Kant) argue things become better when they contribute more to human flourishing - not just pleasure, but purpose, connection, and growth.
4. Time and Iteration
Most things improve through repeated cycles of effort, feedback, and refinement. Practice makes skills better. Iteration makes products better. Reflection makes decisions better.
5. Attention and Care
Neglect degrades; attention restores. Tending to something - a relationship, a garden, a piece of code - often makes it better simply by the act of noticing what needs fixing.
6. The Right Conditions
Plants need sunlight and water. People need safety and connection. Systems need maintenance and resources. Improvement often depends on environment as much as intent.
7. Perspective and Comparison
Sometimes things don't change - our understanding of them does. Reframing what "better" means can itself be the improvement.
The honest meta-answer: better is relative to a goal. Define what you're optimizing for, and the path to better becomes much clearer.
Is there a specific domain you had in mind - relationships, health, work, a product, something else?