Can you buy SPX directly?

I'm curious to know, is it possible to purchase SPX directly, or do I need to go through some sort of intermediary process? I'm new to the world of investing in cryptocurrency and financial markets, and I want to make sure I understand all the steps involved in acquiring this particular asset. Can you provide some insight into the most direct and efficient way to buy SPX, and if there are any potential pitfalls or considerations I should be aware of before making a purchase?