BTC, LTC and ETH are top dogs - you cant go wrong really by buying into those.
I would also look for cheaper coins and look to broaden my portfolio so that I have a spread of investment.
Hope this helps.
Regards
Thank you for guys for your valuable insights. I am buying few of top currencies for the start. Also looking in to proof stake coins but I am not sure if they would be profitable or not but I read some guys are really making or will some bucks there
Take note. Not because a certain coin is in the top 10, 20, or 30 spot on coinmarketcap.com it doesn't automatically mean that it's a good coin functionality and investment-wise. Just a heads up.
If you want to try out proof-of-stake, make sure to do your calculations before going in; and as always, never EVER go all in.