Who are they? if they say next year is not the right time to invest you will believe it? Investment in cryptocurrency is very risky especially if you don't understand about the world of cryptocurrency it isn't recommended. A little advice from me is if you want to invest in the world of crypto at least you have to understand the first place that you will invest. I think that is the best way to start investing, this forum is enough as a reference.

My second suggestion is that if you already understand at least the world of crypto, i have a good coin suggestion to make an investment. The coin name is Ripple, please you research about ripple i think you will like it. Apart from a few days yesterday bitcoin prices and altcoin prices decreased. But what happens to the ripple is experiencing a price increase is the reason why ripple is worth to try to invest.

The first Cryptocurrency to calculate to invest is Ripple. We know what happened a few days back bitcoin prices declined and so did the altcoin others such as ethereum and bitcoin cash decreased, but not for Ripple, even ripple increased prices. Because i understand the advantages of this coin is its value is not affected by rumours and speculation.
And the second coin is ethereum, when looking at coinmarketcap ethereum position is in the second position. I think ethereum is the best coin after bitcoin and has a great potential ethereum price in the future will rival the bitcoin price. One example that the high ethereal nutrient in the future is its ICO payment project using ethereum.

So far I use coinnomi for a wallet in mobile. For security aspect, I think it's very safe to use because coinnomi is an offline wallet, so the risk to be hacked maybe a bit. And when we will send the funds to other people is needed is our password, so if other people try to send funds without our knowledge of our money in the wallet is guaranteed safe.
Besides the advantages of coinnomi is we will get a bitcoin wallet and altcoin wallet, so easy to use in just one application.  so easy to use in just one application. There is no need to make another altcoin wallet, it's very simply right? yeah that's at least my suggestion about the mobile wallet. Hopefully, help your problem.

The best time when you will invest is if you already understand where you will invest. Because it will be very risky if you do not understand it. for example, you buy expensive cars, not knowing how the engine works, and that is fine because if it breaks there are mechanics and garages. Just a suggestion if you choose to invest in bitcoin and bitcoin cash my best answer is to invest in both. 50% invest in bitcoin and 50% invest in bitcoin cash, it's a safe way to invest.

In any investment there will be risky, especially you invest in cryptocurrency world. Make sure you know what you're getting into, and do not risk more money than you could afford to lose. At least you do research on the coin that you will invest.
In response to the question you ask, I think it would be very risky if you put all your money in only 1 coin. But it may be a good idea to play it safe, to invest on the most popular coins only, such as the top 10 by market capitalization. At present, those are: Bitcoin, Ethereum, Ripple, Bitcoin Cash, Litecoin, Dash, NEM, NEO, BitConnect and Monero.

My prediction is ethereum and dash, can we see the price of dash and ethereum in coinmarketcap. He has a stable price but has great potential in 2018 for the price to go up.

I think very dizzy when bitcoin prices are high, we would think waiting for the price down to buy. And now when prices are going down we are still thinking to buy waiting for the bitcoin prices to go down again. So when you buy bitcoin? the answer is still thinking.

Bitcoin market is very difficult to guess. But at least with a very dramatically deacrease prices in recent days, for me this is a good time to buy a lot bitcoin.

ballerin and giroud
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Yeah we will see in the next few days, if it is BTC price as you expect, that's good news for me. Because I have set up money to buy BTC. And now i have 5 bitcoin in my wallet but i will not sell it, i just wait for 2018 i sure the price will be high. That's my strategy in this situation, if you want to sell your btc in this situaton do it that's your strategy, each person must be different in the face of this situation.

i think is temporary, i see in coinmarketcup some altcoin decreased. But they will increas again, i think this time is a good for buy. I suggest for buy litecoin or monero because have potential in 2018 the price will reach $1000.

Everyday i see in coinmarketcap and i don't know i'm very interested to invest in ripple. A few days ago ripple increased up to 50% and the price is $1.14 i just suggest to you to considering invest in ripple, because i belive in 2018 the price will increase.

Ethereum
Dash
Monero
Litecoin

The best coin in january is Bitcoin Cash, Ethereum and Dash. But you can see in coinmarketcap some altcoin have increased price, i think in 2018 is years of altcoin.

I suggest for invest in Bitcoin Cash, yeah we know the price now is very high and for yesterday in coinmarketcap increase until 67%, i think that's good for short term investment.

What do you choose both short term investment or long term investment? If you want to choose for short term investment i suggest for choose BCH, but for at the moment the price BCH is very high he have to increase up to 67% for now. And than if you choose for long term investment i suggest for choose ethereum, because he have a stable price but in the future he have a big potential the price will be high.

Bitcoin Cash has increased to 67%, i wanna say give applause for BCH, I don't believe this. Just enjoy every second, because after the incident last month BCH prices dropped too drastically, i think BCH is good for short term investment.

If that is real price, it would be good project. Just answer our ask dev, i'd like to join if that real price.

So far my country has banned bitcoin precisely in early December yesterday, and make me really mad. But if my country legalizes bitcoin, it will be very happy because i will free to use bitcoin in all transactions. Yeah i will see in the future perhaps my country will lagilizes bitcoin.