How do I buy all cryptocurrency types?

Excuse me, but I'm curious about how one would go about purchasing all the different types of cryptocurrencies. Is there a centralized platform or marketplace where I can find and purchase them all in one place? Or do I need to visit multiple exchanges or use specific methods for each type of cryptocurrency? Additionally, what are some important considerations to keep in mind when buying various cryptocurrencies, such as fees, security, and liquidity? I'm eager to diversify my investments, but I want to make sure I'm approaching it in a SAFE and informed manner.