Will link you some, ofc depending on type of serviece and means of payment price can vary, do note that bitcoin has a bit higher fees at the moment which don't make it number one choice to use it, untill thats sorts out.
Here are some places:
https://localbitcoins.com/ ,
https://cex.io/,
https://www.bitcoin.de/,
https://www.bitpanda.com/ ,
https://bitsane.com/ ,
https://www.bitstamp.net/ ,
https://anycoindirect.eu/ ,
https://paxful.com/I like localbitcoins , bitcoin.de and paxful tbh, price rate might not be the best but for privacy purpose. They act as middleman to pair you with people to do p2p trades, chose reputable seller/buyer and you should be fine, coins are in escrow + you can ask them for support if needed.
There´s a lot of international exchanges you can use from germany. It may depend on the deposits you want to make at first. For example, I´ve registered on cryptopia a few days ago and the verification process was really fast. It´s an exchance from new zealand (cryptopia.co.nz) but I didn´t need to deposit euros or dollars.
You could also try bitcoin.de. It´s more a kind of marketplace where you can buy your coins directly from other users.
Another, very easy way to trade Bitcoins and some others is the Waves DEX. Very low trading fees! You can also deposit USD or other currencies but you also need a verification for that and I haven´t tried that yet.
Cryptopia doesn't offer fiat trading to my knowledge, they are more like an exchange between cryptocurrencies in general.
