You and you alone are responsible for your cryptocurrencies and their security is only your concern. “ is the first and most important thing to know

The public key is the address that anyone can use to send you the money. On the other hand, the private key is what you will use to send money to anyone else. ONLY you should know what your private key is, remember that, and under no circumstances should you ever lose your private key. Otherwise anyone can use your wallet to send your money to any other addresses.