The usage of the verb aim depends on the context:
1. aim + at + noun
used when specifying the target or goal
example:
She aimed at the target.
2. aim + to + verb
used when expressing an intention or goal
example:
He aims to finish the project by Wednesday.
3. aim
used alone in some cases, especially in commands or casual speech
example:
Just aim and shoot.
4. aim + for + noun
used instead of "aim at" to express targeting something as a goal
example:
We aim for excellence.
Each structure slightly shifts the meaning or focus of the verb aim.