Payment Methods – What payment methods are available on the exchange? Credit & debit card? wire transfer? PayPal? If an exchange has limited payment options then it may not be convenient for you to use it. Remember that purchasing cryptocurrencies with a credit card will always require identity verification and come with a premium price as there is a higher risk of fraud and higher transaction and processing fees. Purchasing cryptocurrency via wire transfer will take significantly longer as it takes time for banks to process.
I strongly suggest only seriously entertaining the top say 100 coins by market cap. I personally rarely consider an investment in any coin that isn’t roughly in the top 10 – 20 (there are some rare exceptions, such as with ICOs, but I’m never putting the bulk of my investable funds in anything without proven staying power and community in almost every case).
Founded in 2011, Kraken is the largest Bitcoin exchange in euro volume and liquidity and is a partner in the first cryptocurrency bank. Kraken lets you buy and sell bitcoins and trade between bitcoins and euros, US Dollars, Canadian Dollars, British Pounds and Japanese Yen. It’s also possible to trade digital currencies other than Bitcoin like Ethereum, Monero, Ethereum Classic, Augur REP tokens, ICONOMI, Zcash, Litecoin, Dogecoin, Ripple and Stellar/Lumens. For more experienced users, Kraken offers margin trading and a host of other trading features. Kraken is a great choice for more experienced traders. Check out the Kraken FAQ
There are several different types of cryptocurrency wallets that cater for different needs. If your priority is privacy, you might want to opt for a paper or a hardware wallet. Those are the most secure ways of storing your crypto funds. There are also ‘cold’ (offline) wallets that are stored on your hard drive and online wallets, which can either be affiliated with exchanges or with independent platforms.
Dash, which was formerly known as Darkcoin and Xcoin, is an open-source peer-to-peer cryptocurrency with the goal of being more user-friendly than other options. Dash created masternodes, which provide incentives to users to help secure the network and assist with user-friendly features, such as InstaSend - which significantly speeds up transaction-processing times.
Once you bought your cryptocurrency, you need a way to store it. All major exchanges offer wallet services. But, while it might seem convenient, it’s best if you store your assets in an offline wallet on your hard drive, or even invest in a hardware wallet. This is the most secure way of storing your coins and it gives you full control over your assets.
Two members of the Silk Road Task Force—a multi-agency federal task force that carried out the U.S. investigation of Silk Road—seized bitcoins for their own use in the course of the investigation.[68] DEA agent Carl Mark Force IV, who attempted to extort Silk Road founder Ross Ulbricht ("Dread Pirate Roberts"), pleaded guilty to money laundering, obstruction of justice, and extortion under color of official right, and was sentenced to 6.5 years in federal prison.[68] U.S. Secret Service agent Shaun Bridges pleaded guilty to crimes relating to his diversion of $800,000 worth of bitcoins to his personal account during the investigation, and also separately pleaded guilty to money laundering in connection with another cryptocurrency theft; he was sentenced to nearly eight years in federal prison.[69]

A cryptocurrency (or crypto currency) is a digital asset designed to work as a medium of exchange that uses strong cryptography to secure financial transactions, control the creation of additional units, and verify the transfer of assets.[1][2][3] Cryptocurrencies use decentralized control as opposed to centralized digital currency and central banking systems.[4]