If you have any spare rooms left in your property or a full property available, you can rent that property to services like Airbnb, etc. to generate revenue. But you have to put in extra effort and maintenance costs to make the property in great shape.
You have the option to invest in REITs or Real Estate Investment Trusts. These companies are just like stock investment companies but they manage the real estate directly. They provide you with revenue through dividends.
Land Ownership: Simply buy the properties and keep them up for rent. You have to manage the maintenance and some other basic costs and find the tenants for the property.
Many online portals can help you invest in real estate with less amount. You can play the role of becoming a part-owner of a certain property and get great revenue from that property.
Buying a property with different units for eg a duplex. You can live in one part of the duplex and rent the other portion to generate revenue and also help in saving the living expenses.