Need help with chord shapes

I’ve been researching what these shapes are called or whatever there called cause so many songs I listen to use this with clean guitar mostly in the intro like for example: I do think of you in September - beforeyouleave and Frozen in Melancholy - Wintercult. Use that cool clean guitar sounding intro and I really wanna know how to make intros like that but I have no idea what the shape of the I guess “chord” or something is called so can someone please help me with this or just tell me what it’s called so I can learn more about those shapes.