Tip: If someone tells you to invest in a coin, don't do it. In this environment, you have to go the extra mile on doing your own reading.
People in this space (especially newer generations) tend to fall very easily for certain projects and dismiss those that have been around longer. For example, people will tell you a certain X coin is 100x faster than Bitcoin, but what they don't tell you (or they don't know) is that it is likely very centralized or lacks security to compensate for that "quickness".
I'd suggest first reading on why Bitcoin became successful after so many other people attempted creating digital currencies before it and move on from there. I think it's important to know why Bitcoin still persists today. It's good knowing the fundamental basis of this whole crypto movement. Once you gain that understanding, it becomes easier to see why other projects fail or why they succeed.