Why do wallets use multiple private keys instead of one each? I am learning about Bitcoin and when I was about to export my private key from a single electrum wallet, I found that there  were in fact a lot more than one. Why is that so, don't you only need 1 private key to hold all bitcoins and manage them?
Why is that so, don't you only need 1 private key to hold all bitcoins and manage them?


Sure you could use only one private key and its associated address, but that is not recommended. It is more secure and more private to not reuse addresses. Instead you should use a new address for every transaction you receive and for every change output you make. Thus your wallet will have multiple private keys for the multiple addresses that you are using.