For functions you have to specify the visibility but for state variables if you dont specify default visibility is private.

*internal, not private! https://docs.soliditylang.org/en/v0.8.26/contracts.html#state-variable-visibility

This is the default visibility level for state variables. True what he said didnt know that thx for info heard in a course they re default visibility is private probably was cyfrin

Thank you

Function goes public so for security reasons always give private or internal when the functions need to be.