Hey community

I'm very ill,not for some petty sentiments for real;dunno if feminism has anything to do with that😔 ..anyways that's on the contrary.
Priv keys are the gateway to unlock or transact Sats; I have also seen some peeps wearing avatars with 'NOT YOUR KEYS,NOT YOUR COIN' indited on it.
The standard privkey is a 256bit: 0x01 and 0xFFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFE BAAE DCE6 AF48 A03B BFD2 5E8C D036 4140 .. it runs on its range of secp256k1 ECDSA right?
Now I have learnt that in order to make mistakes, WIF(wallet import format) could help the whole stress,of which it runs on base58Check. well thats not the point,just had to detail out atleast someone could get the fact that I understand maybe a little..
Mini privkeysI wanted to understand how it's calculated and I was told that when the there's a product,if the very first byte results to `00', it's well calculated.
Question:
+Since the SHA256 hash is calculated just by the selection process of random numbers, which forms a polynomial and prolly an interger, what's the probability of getting an `00' just by choosing at random?
+ Why is the generation of priv and public keys from bitcoin address archaic but the elliptic curve multiplication and the hash function can rather be used symmetrically? Which looks like the best way for a derivatives
ECDSA ; this should be my next topic
I'm not really sound though 🥺
Thanks for response and infact, I really need alot of opinions cus I need to learn ahead.
Sandra_