Coinbase!
Backed by trusted investors and used by millions of customers globally, Coinbase is one of the most popular and well-known brokers and trading platforms in the world. The Coinbase platform makes it easy to securely buy, use, store and trade digital currency. Users can purchase bitcoins, Ether and now Litecoin from Coinbase through a digital wallet available on Android & iPhone or through trading with other users on the company’s Global Digital Asset Exchange (GDAX) subsidiary. GDAX currently operates in the US, Europe, UK, Canada, Australia and Singapore. GDAX does not currently charge any transfer fees for moving funds between your Coinbase account and GDAX account. For now, the selection of tradable currencies will, however, depend on the country you live in. Check out the Coinbase FAQ and GDAX FAQ. if you plan on trading ethereum litecoin or bitcoin you will need to use Gdax to save on fees
Pros: Good reputation, security, reasonable fees, beginner friendly, stored currency is covered by Coinbase insurance.
Cons: Customer support, limited payment methods, limited countries supported, non-uniform rollout of services worldwide, GDAX suitable for technical traders only.