If I invest in a popular project does that make my money safe from scams or popular projects can turn to scam as well?
Not all popular projects can provide a sense of security for placing money in your investment. Terra Luna and other coins were once popular, but ended very tragically.
This overview is a small sample for your decision-making, it is worth noting not only the popular level, but the strength of the coin that can withstand any conditions and better take on a role in a project that has slowly increased, but has strong support.