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The phrase 'you better' is correct and can be used in written English.
It is usually used as an imperative (a command) to suggest that someone should do something. For example: "You better start studying for your test, or you won't be ready."
Exact(59)
"You better.
"Competition makes you better.
You better believe that".
"You better," he said.
It makes you better.
You better watch it.
They make you better".
You better believe it.
You better smile".
You better start running".
"You better produce, and you better work.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com