You can throw money into well-known diversified investments. If you want to be more adventurous, and feel like you know what you’re doing, then try to understand the real underlying economics behind what you hear every day on the TV. Buy a book or two on basic economics (Econ for Dummies….), and try to decipher how various things you hear about get factored into the GDP number.
My favorite is how making it very difficult for people to do worthwhile things can actually make the GDP measure of economic welfare bigger. Imagine someone making good soup every day, selling it for $2 a bowl. Then imagine paying an attorney to entice customers to sue the chef. The chef charges more for the soup, and the wages of the attorney are also counted in GDP. We have the same soup as before, but the GDP is a lot higher. A lot of our economics is like that, but most people don’t realize it, and most economists lose sight of it.
Anyway, after 5-10 years of learning, you should begin to be able to make your own investment choices.