Gonna be a short one since Sunday is my busiest day.
Low risk investments are generally lower yield, they have a lower possibility of failure or loss. Think of bonds, houses, and gems.
So what are the options? Houses are self explanatory, buy one and it will increase in value, maybe make it a rental home and get rent money from it. Bonds are loans you give to organizations, think government and banks. They are generally long term and lower risk, he rates can fluctuate on them and that means you may lose some money on them even halfway through a bond's term. That lose is based on the health of the economy so still lower volatility than stocks.
Funds(also called ETFs) are a stock grouping, think of it as a goody bag filled with different stocks. These are generally safer than manually investing because funds have safer socks mixed in with more volatile stocks that could jump and make you loads of money. So a lower risk for people looking into getting stocks without the anxiety of it all crashing down.
Businesses: You can buy already made businesses, on sites like Bizbuysell, Flippa, and more. Because these sites sell businesses that are generally established and have a good history. Meaning you won't be scared of the business failing right when you take over.
That should be it but ask questions and Hopefully I have the answer.