There are many types of alternative investments. Some of the more popular offerings are hedge funds, private equity, crowdfunded like wine or geeky collectibles.
Many companies give you the ability to invest in commercial and residential real estate projects without actually doing the heavy lifting yourself. It's often better having your very own real estate agent.
Dividends are profits paid out to owners of stocks. Some companies pay dividends regularly, which means that dividends can become a dependable source of income.
An index fund is a mutual fund that owns a wide assortment of assets. Some index funds are fairly focused (e.g., an automotive index fund might own all automotive stocks)