$12000 is a big amount to invest but I would suggest you to invest 2000$ each in six coins so that your investment will be diversified. First of all do yourself some research of top 50 coins from coinmarketcap list then decide what is best for you. I have some good coins list you can check. You can consider  DeepOnion, Bitcoin, Waves, Stratis and Xmr. There is always risk in any investment. Invest that you can afford to loose.