Like a genuine key, a private key allows you to spend your money. The most crucial aspect of your overall security is keeping your private key and access to it secure. The only thing that the key is is a very large number that no one could possibly guess. You can generate a private key by flipping a coin 256 times and recording "1" for heads and "0" for tails. Here is one that we recently produced. For a more compact representation, it is encoded in hexadecimal (using numerals 0–9 and letters a–f):
8b9929a7636a0bff73f2a19b1196327d2b7e151656ab2f515a4e1849f8a8f9ba
If you search for that number on Google, you'll discover that this post is the only place it appears (barring any later instances where it has been copied). That should give you an idea of how truly random the number is because there are extremely slim chances that anyone has ever seen it.
That illustration is still inadequate. Nearly as many atoms make up the known universe as there are potential private keys. This may be summed up as a key security tenet in crypto networks like Bitcoin and Ethereum. Your coins are secure because they are dispersed within a mind-bogglingly wide range.
Public addresses, which are likewise strings of seemingly random numbers, will be recognizable to you if you've ever received money. These can be acquired by performing some cryptographic tricks on your private key to produce a public key, which is then hashed to provide the public address.
In this piece, we won't go into detail on how this is accomplished. All you need to know is that while creating a public address from a private key is simple, doing the opposite is currently not doable. You can therefore post your public address on blogs, social media, etc. without risk. Without the associated private key, no one is permitted to use the funds supplied to it.
You can't access your money if you misplace your private key. The money can be used by someone else if they figure out your key. Therefore, it is crucial to keep your secret key hidden from inquisitive eyes.
https://academy.binance.com/en/articles/how-to-secure-your-cryptocurrency