Can you suggest me which one is best Altcoin coin hold for 2018? 
No one is not likely to be a beginner as long as it works hard and truly everything will come true. Some of the coins in 2018 that I saw like NEO, ETH, Zilliqa, X and TRX in my opinion were good to hold and in the current year they might increase. Hopefully by 2019 there will be many good altcoins that can be hold.