Using your own research and assessment, it's only you who can decide. It's not easy as there are lots of factors to consider
before investing to this market.
Make sure to check the market movements using CMC or COingecko, they've got lots of information that are very useful before
deciding which coins to buy.
Personally I do my own research too when it comes to a new rising and promisung altcoins today but to be honest I am lazy when it comes searching for a great potential altcoin it is because we are having a 10,000 altcoin in the market and that was too huge and time consuming if we were going to read every white paper of every project right. And for me that is why it is useful to rely in someoned advises too, like their reviews or experience using that token, and from that is my point to check the white paper of a certain project.