DDoS is a bitch which can takedown basic websites
I hate you guys if you do this. I don't want you to do this if the website isn't yours or if its not for educational purpose.
And I am not gonna spoonfeed you with each and every line of commands to under in terminal or command prompt. Its a python script, I am giving link to it directly so those who understand what they are doing will do it mostly.
https://raw.githubusercontent.com/IkzCx/ProgramsForDDos/6242138f4a1fbbcb24c329f47282e7a73fc3864c/Saphyra.py