can someone suggest me best coins to invest in 2018 which are less than 5 or 10 cents
Cardano (ADA) is best
Apart from the fact it's much higher than 10 cents already. Verge is currently hovering around 10 cents and could be the big thing for 2018. The price increased a lot in late 2017 but it's a great privacy coin and can increase towards $1 across the year.