Before looking at fund flows, get the basics down. Today, we're talking about the Ethereum ERC-20 standard.
Because interfaces are standardized, wallets and exchanges can recognize newly issued tokens without having to add support for each token individually.
When importing a custom token, verify the contract address through official channels or a block explorer. Don't trust addresses sent by strangers.
ERC-20 tokens are issued on Ethereum, and each transfer requires $ETH to pay for Gas.