Which is a safe coin to invest in the long term?
How long should I hold it?
Is there a risk that I might lose it all?
I am a noob in cryptocurrencies. Help.

I was thinking Litecoin, is it a good idea?
I recommend you to hold the ETH & RIPPLE. Cox it is the very popular and the established coins. It's have a good investment for the long term. I believe its price will be grown in the future. it will give you a huge profit in future.