Yes - you can have both wired and wireless devices on the same network.
The desktop will use its wired network adapter and the laptop will use its' wireless network adapter.
Both adapters will need to be configured to join the network hosted by the router.
You will need the necessary administrative rights for the router, desktop, and laptop, in order to do so.
Once the laptop and desktop are both on the same network they can indeed share folders and connected devices such as a printer or USB drive.
However, both the desktop and laptop will need to be configured to do so and must have the necessary rights as well.
Here are a couple of links to get you started:
https://www.webnots.com/guide-to-windows-10-network-and-sharing-center/
https://pureinfotech.com/setup-network-file-sharing-windows-10/
There are many other similar links to be found.
What you
do not want to do is to just "go in" and start making configuration changes.
What you do want to do is to explore all of the screens, windows, configuration options, etc. to learn where they are located and how they are currently configured. On both the desktop and laptop.
Then you should make a plan that, step-by-step lists what you need to do and what configuration settings you will be using.
Keep the plan simple. Focus on getting both computers on the network and visible to each other.
Then set up/create a test folder on each computer to share with the other computer.
Then set up/create the sharing.
Pay very close attention to the windows, tabs, inputs, check boxes, properties, etc..
And, as always, be sure that all important data on both computers has been backed up and verified to be recoverable and readable.