Answer 1

that is not correct. You can use public, protected, private (sorted by visibility.)
Static is a modifier,later about that.

Public is,
when a method is public it can be accesed from everywhere. (class, package, subclass, world)

Protected is,
when a methid is protected, it can be only accessed by its own package-level classes(class, package, subclass)

Private is,
when a method is private,it can be only accessed by its own class-level methods

When tgeres no modifier, it can only be accesed by the class and package.

static defines wether the method can be instantiated. This is required on the OOP-level of programming, you can always check with instanceof.