so i was playing as usual my own server to test if things were okay, i was the only person only like always and out of nowhere this guy comes and says hey are you the administrator ? i said no o.0 but i was, he then said im going to hack the website and give you points , i said good luck with that, then 5 mins later he said wow this administrator doesnt know how to protect his website he said i gave u 1000 points go buy stuff at shop, he then said im going to make myself administrator, i said lies lol, he then after like 4 mins told me wow group 6 here is not god maybe is 5, thats where i got really scared, i checked my phpmyadmin database i checked the player table and everybody changed from group id 1 to 6 lmao i then shutdown my server and stoped apache and mysql from xamp and uninstalled all services (((( what are some stuff i can fix to prevent people from hacking me?