In my opinion. The best investments depend on your ability and knowledge. Before you enter to the investment, you should always be prepared. If you dont know your investment, there are a lot course on the Google or you can buy books, attend a seminar to improve your ability and skill. The best investment nowadays is bitcoin because the value is on the dip. Bitcoin can also buy the minor coins like bash, Ripple, and others. Good luck have fun on your investment.
There is a big risk in investing so you have to make sure you did research before risking your money to have better success rate.
So far, the best investment I can recommend is the crypto market, it's getting bigger and its still young at the moment but the development is getting better so we can expect the increase of value overtime.
Many people join ICOs randomly and then they be very upset. People should make a good research before they start their investments. This is the only way of not losing money and making the best investment.