Is there a Difference between "Main Account" and "Account 1", because I lost my password for the Main Account, which has no Eth on it? Do I need the password for the main account in any way (technical or maybe in the future for updates etc)? Thx.
Is there a Difference between "Main Account" and "Account 1",
It depends what you mean by "Main Account".
The accounts are 0-indexed, meaning your "first" account is
web3.eth.accounts, your "second" account is
web3.eth.accounts, and so on.
Your coinbase account is the account to which any mined ether are sent. By default this will be account
0, but you can change it to point to any of your other accounts, e.g.
web3.eth.coinbase = web3.eth.accounts.
Danger: Back-up your keystore before following the below part
If you want to remove any of your accounts, remove the associated folder from your
~/.ethereum/keystore/ directory. Removing your unused
account will cause any later accounts to shuffle up, meaning your old
account will become your new