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An Ethereum account is a cryptographically secure random 256-bit integer, also known as a private key in public key cryptography.
Wallets are just a collection of accounts.
A good learning material inner working for Ethereum accounts is the source code of eth_account Python package.
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You may want to check sources of Augur Project, they have exactly the wallet contract you are describing:
contract AugurWallet is Initializable, IAugurWallet {
using SafeMathUint256 for uint256;
IAugurWalletRegistry public registry;
mapping(address => bool) public authorizedProxies;
uint256 private constant MAX_APPROVAL_AMOUNT = 2 ** ...
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In the current version of Ethereum an address has 160 bits, so there are at most 2^160 different contracts.
The ERC 20 standard implicitly assumes that an address contains a single token, so an EOA can have at most 2^160 EIP-20 tokens.
There new standards like EIP 1155 that allows a single address to manage multiple tokens. An id of type uint is used to ...
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To obtain real Ether, you need to buy it. You buy it from a cryptocurrency exchange with fiat money (US Dollar, Euros, whatever is your national currency).
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No harm, you can always add it back. This is just the standard local development url.
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