Use `sizeof(array) / sizeof(array[0])` for a statically allocated array in the same scope
Example: `int arr[] = {1, 2, 3}; size_t len = sizeof(arr) / sizeof(arr[0]);`
Use `sizeof(array) / sizeof(*array)` as an equivalent form
Use `strlen()` for C strings, not for general arrays
Example: `char str[] = “hello”; size_t len = strlen(str);`
For dynamically allocated arrays, store the length separately
Pass the array length as a function argument when needed
Use `sizeof` on pointers only gives pointer size, not array length
`sizeof` cannot determine the length of an array after it decays to a pointer in a function parameter