Most coins drop in value after a while, so you might want to check the current price of each coin at DEX.
Its hard to do predictions now a day with so many coins out there, but the general rule is that you can "semi" trust coins that have active developers, and a clear vision on how they plan to get consumers to use their coin.
Agree. Project has to be 100% active to be sure, so pay attention to their social media and updates. Saw a project called NewsCrypto the other day and they are pre-funded, looks promising.