How do anda become a die hard fan and stuff? (sorry if already been asked, i couldn't find the answer)

Easy anda find the person u really like (celebrity of course) and then just get really into them buy their stuff for example i am a die hard fan for taylor lautner so i get shirts and thangs wit his name on it and that crap then i find out every little detail about them and there anda go a die hard obsessed fan