Both bitcoin and altcoins are very high risk investment, if you looking for super duper mega ultra double extra safe then you should go for property investment 
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But first of all op you should never ask for financial advice here, there's a lot of people randomly giving thoughts around, take this discussion as a consideration but never pick it 100% .
Always making plan B if your investment went wrong, don't put your money in a single investment that's the fatal mistake made by newcomers and educate yourself to manage money properly, that's all the basic instruments that every investor/hodler should have.
This is important, since we are being asked a question about how to invest then we're going to give an answer, however it will be really irresponsible to take the advice of anyone here and follow it 100%, the right approach will be to take all of the responses here with a grain of salt and investigate the few opinions that you think have some merit to it, this will take time but in the process you will learn a lot about the markets and you will be able to choose the right strategy for you. .But first of all op you should never ask for financial advice here, there's a lot of people randomly giving thoughts around, take this discussion as a consideration but never pick it 100% .
Always making plan B if your investment went wrong, don't put your money in a single investment that's the fatal mistake made by newcomers and educate yourself to manage money properly, that's all the basic instruments that every investor/hodler should have.
I know that this approach works because this is what I have done, I read the responses of other people and when I see something interesting I make a research and see if they are right.