Congratulations!
Yeah, I experienced profits as well, and I'm very glad that the crypto market has finally started to recover. Fortunately, those times of bear market have gone, and I never doubt that Bitcoin will rise in the end because it's the soundest crypto among others. So, I suppose we will see "December 2017" once again

You have several options for trading BTC/EUR and your choice will depend on your preferences. I’d advise you to try one from these 3 platforms: Bitstamp, EXMO, or CEX.IO. They all are European-based cryptocurrency exchanges that means EUR deposits via any kind of payment method is easier than using other platforms. Those who use SEPA payment will be happy.

Personally, I prefer Cex because of high security, diverse payment methods including SEPA, and easy to use interface: https://cex.io/btc-eur. I can compare this platform with Coinbase in terms of usage. It’s great, and I didn’t have any problems with it. The only thing is long registration. The limits of deposits and withdrawals depend on the level of verification. It says about compliance with regulations and strong security.   

There are many options to choose from. Many comments featured Binance as the best platform for altcoins trading. I agree on it because I was using it for several years by myself, but in as much as Binance experienced a massive security breach on May, which resulted in a theft of 7,000 bitcoins (https://cointelegraph.com/news/hackers-withdraw-7-000-bitcoins-in-binance-crypto-exchange-security-breach), I have some doubts about continuing using it. In general, centralized crypto exchanges are an undesirable place for storing your crypto funds, no matter how secure they are or how secure they claim to be. I think in this situation we can only rely on the platform’s history. For instance, I use CEX: https://cex.io/btc-eur, a crypto exchange that has never been hacked. This fact speaks for its reliability and enhanced security measures. The UI is intuitive and easily navigable, plus there is a mobile app for Android and IOS. As a bonus, in addition to the crypto trading, it supports fiat to crypto pairs.

I found this idea interesting in terms of making cryptocurrency easier to buy, store, and more accessible for average mobile phone users. Promoting crypto adoption by a big player such as Samsung can encourage other brands to embrace this innovation. And it definitely will make good for the whole crypto community. But Samsung should pay attention to the security issues because crypto is a very sensitive thing. Digital thieves eye to find the tiniest vulnerability to get your bitcoins.