functions that return pointers (SDL2)

In SDL2 there is a function

SDL_Window*SDL_CreateWindow(constchar*title, int x,
int y,
int w,
int h,
Uint32 flags)

the return value of this function is SDL_window* which is a pointer and there are some other functions (like SDL_DestroyWindow (SDL_Window* window)) which takes the SDL_Window pointer as an argument.
How can we define these kind of pointers defined?
Is it mean that we have a pointer that points a struct with slots x,y,w,h,flags?
Do we need to define these kind of pointers like pointer to int or pointer to float?

Code:

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SDL_Window *win;

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The documentation for the Library and functions would have provided this information and more!

> Is it mean that we have a pointer that points a struct with slots x,y,w,h,flags?
> Do we need to define these kind of pointers like pointer to int or pointer to float?
Let's illustrate your question in terms of FILE* from stdio.h

Code:

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FILE *fp = fopen("filename", "r");
int ch = fgetc(fp);
fclose(fp);

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A 'FILE' is what is called an opaque type - Opaque data type - Wikipedia
You can't meaningfully do anything along the lines of fp->member to get at information about the open file. You must use the appropriate interface function, passing fp as one of the parameters.

The same goes for a SDL_Window *win pointer. Your only task as a programmer is to keep that pointer safe, and pass it along to whatever other SDL_xxx functions you want to call that take a SDL_Window * pointer parameter.