C-language String declaration

Re-learning the C-language string declaration
Char *a= "Nihao";
Char a[]= "Nihao";
What's the difference?
The former defines a pointer and points to the string constant "Nihao", which is an array of strings.
The difference is that char * a = "Nihao", the A pointer itself can be varied, such as a = "123", but it is not possible to manipulate string constants, such as a[0] = ' 1 ' is illegal.
Char a[] = "Nihao" means that the character array is initialized to "Nihao", a itself cannot be changed, such as a = "123", but the elements inside a can vary, such as, a[0] = ' 1 ' is legal.

C-language String declaration