Personally, I will focus on infrastructure altcoins as opposed to Daap's or app based altcoins. Try and focus on practical application altcoins. Altcoins that you see beneficial to everyday life and usefulness. If you can try and find a mentor online or on youtube somewhere that has been in the cryptocurrency market for a while and follow them to see what they and there followers are doing or buying or are interested in. The last resort would be to just invest in one of the top 30 altcoins on coinmarket.com, which to me is the safest way to go because they are already established altcoins plus you can find some there at a bargain.