Anyone who wants to buy Bitcoin quickly loses the overview with the large number of providers and different options.
The simplest form is to buy Bitcoin from a Bitcoin ATM or in Austria and Switzerland as a voucher at a kiosk (tobacconist's) or gas station, while the best known option is to buy Bitcoin at a Bitcoin Exchange.
An exchange aggregates supply and demand and its customers buy from the exchange system. After a deposit of a Euro amount (e.g. by bank transfer), trading in crypto-currencies is possible and the payment can be made via Bitcoin.
A Bitcoin exchange trades in real Bitcoins. e.g.: Kraken, Bitstamp, Bitfinex.
Opposite them there are Bitcoin brokers who trade in financial products based on the Bitcoin price. If you do not want to buy real Bitcoins, but only want to speculate on the development of the Bitcoin price, you will find the right provider here.
A marketplace lists the individual offers and participants trade directly with other participants. Providers include Bitcoin.de, Localbitcoin and Bisq
Whoever wants to purchase Bitcoin to load their own wallet and use Bitcoin for payment will find the right provider at exchange offices.
They know the system from the airport. You change your own euros into the currency of your holiday destination before you travel abroad - the same applies to Bitcoin exchange offices.
At a fixed exchange rate, Bitcoin is exchanged for euros or purchased directly from the operator at a fixed price. Payment for Bitcoin is made by the usual Internet payment methods such as credit card, SEPA bank transfer or online bank transfer.
Providers are e.g: Anycoin, Bitpanda, BTCdirect, LiteBit, HappyCoins, Coinify, Indacoin, Bity, Coinfinity,