This thread is to know how you get your own private key. The purpose is to know what way you use and in order to find the most security way to get your private key, without mattering what for people want to get it. Just let your way how you get. Be the most specific possible and by this way we and many people can know how much ways there are for this...
The answer is simple, generate it, you should generate it from the website that connected directly to the blockchain, for example myetherwallet (MEW), Stellarterm, Stellarport, etc. You can generate your wallet address and also your private key from them.