The complete guide from ethereum.org

Direct ownership Your bank balance is a custody promise . Your Ethereum balance is true ownership. $4.6B+ Daily trading volume (USD) Public rules The code is public， youre in. Nobody owns Ethereum Changes happen through open proposals that anyone can participate in. Think community garden versus corporate farm. ， agreements execute exactly as written. Think vending machine versus hoping the cashier gives correct change. Global Anyone， no account approval. If you have internet， no minimum balance。

anywhere can use Ethereum. No permission needed. Free access No credit check，。