It's all kinds of things. I recently read a suggestion that you should be able to remove everything from a function's source except the declaration and the comments, and still know exactly what it does. I'm thinking about adopting that stylistic choice, and after a few weeks/months come back to reevaluate if it's worthwhile or overwrought. Or it will just be so obviously great that it becomes a permanent part of my stylekit.

By style I mean it closer to writing style. How you express your thoughts. For example checking preconditions and returning an error in a block up front instead of mixed in with the computation, or nesting your computation in a bunch of precondition if checks.

Bracket placement is trivial and can be formatted with a tool in a second or two so play around with that all you like.

It's not only about formatting or naming. It's about how you break down the problem. I sometimes write functions for a certain problem and later realize that I have written the same thing 3 years before. When I compare the code it's almost the same. Almost same function name, same parameters, same result type.