Hello,
In case you don't know this already and you are asking yourself how can you buy Bitcoin, Ethereum or any other cryptocurency, I've put together below a quick guide on how to get started.
The best place to buy cryptocurency without to much hassle (and very safe) is Coinbase. Here you can buy Bitcoin / Ethereum / Litecoin from Coinbase with your credit card. If you want lower fees you can make a bank transfer to fund your account and use GDAX exchange which is also part of Coinbase.
In order to create an account on Coinbase you can use my referral link which also gives you $10 once you make any transfer of minimum $100: https://www.coinbase.com/join/59257a70eb342e198c01d523
Note: I recommend buying Litecoin - LTC if you are planning to exchange it with another cryptocurency on other exchanges, since the fees to transfer are lower and they are much faster compared to BTC or ETH
Once you have BTC / ETH / LTC you can transfer them to any other exchange to buy other cryptocurencies (altcoins). One of the biggest exchanges and one of my favourite ones is Binance.
You can use the following link to create an account on Binance: https://www.binance.com/?ref=16881261
Hope this helps to get you started :)