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 prefer you to have to buy the BTC and ETH now. Because it's have a very good feature and the plans. It has a very high demand and the price at this moment. So I recommend you to invest in these coins now.