It is difficult to answer your question because the market is bearish since 8 months and any beginner who would like to invest in cryptocurrencies, would be scared to see so much volatility in the market. Even so the best and most conservative would be to bet on the top 10 coins for example because they are projects that have proven their strength and it is more reliable to invest in recognized projects than to bet on new projects right now. The important thing is to do your own research and to foresee that if you buy right now, you should consider holding for a more longer time to expect benefits.