Animate surface in SDL/SDL_gfx library - c

Question

I'm recreating the game 'super hexagon' in c using sdl2 library.
I have drawn the circle in the middle of the application and the little cursor(not the mouse but the triangle around the circle) that is supposed to move around it when the player interact with the keyboard (left and right keys) like so:
void Game_run(struct Game *game)
{
//Previous rendering are cleared.
SDL_RenderClear(game->renderer);
//-------------------------------------------------------
if (filledCircleRGBA(game->renderer,SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2, 10,255, 255, 255, 255) != 0)
{
fprintf(stderr, "Error: the circle was not rendered\n");
SDL_DestroyRenderer(game->renderer);
}
arcRGBA( game->renderer, SCREEN_WIDTH/2, SCREEN_HEIGHT/2, 100, 0, 80, 255, 255, 255, 255 );
filledTrigonRGBA (game->renderer, CURSOR_POSITION_X-10, CURSOR_POSITION_Y, CURSOR_POSITION_X+10, CURSOR_POSITION_Y, CURSOR_POSITION_X, CURSOR_POSITION_Y+10, 255, 255, 255, 255);
SDL_RenderPresent(game->renderer);
//-------------------------------------------------------
//We are payng
game->state = PLAYING;
SDL_Event event;
SDL_bool GameRunning = SDL_TRUE;
while (GameRunning) //while the player didnt loose, the game is running
{
while (SDL_PollEvent(&event))
{
/* code */
switch (event.type)
{
//when a key is pressed
case SDL_KEYDOWN:
//Detecting the pressed key
switch (event.key.keysym.sym)
{
case SDLK_LEFT:
printf("Left key pressed\n");
break;
case SDLK_RIGHT:
printf("Right key pressed\n");
break;
default:
break;
}
break;
//when a key is unpressed
case SDL_KEYUP:
switch (event.key.keysym.sym)
{
case SDLK_LEFT:
printf("Left key up\n");
break;
case SDLK_RIGHT:
printf("Right key up\n");
break;
default:
break;
}
break;
//if the user quit the game
case SDL_QUIT:
//The game is over
GameRunning = SDL_FALSE;
game->state = GAME_OVER;
break;
default:
break;
}
}
}
}
I have already implemented the event listener to detect the user input.
But I have no idea how to animate those elements.
How should I approach the problem? I want to understand how animation works when i render elements using gfx functions..do i need to load the drawn elements into a SDL_Surface first?