How do i add multiple desktops on my laptop?

Mission Control – Work in Multiple Spaces

1. If you want to keep the desktops in a specific order, go to System Preferences/Mission Control and uncheck the box " Automatically rearrange spaces based on most recent use." You can also select the box below that so if you open an application, you'll be taken to that space.
2. If you want to cut down the number of desktops, there is also an option to remove the Dashboard as a desktop and have it work like it did in Snow Leopard. That can be set in System Preferences/Mission Control by deselecting Show Dashboard as a space. You can access the Dashboard by clicking on the Dashboard icon in the dock or using the FN 12 key.