Extending wifi from ethernet extension

[Bolu]

Downstairs I have a Virginmedia Hub 3. From there I run an ethernet cable to a TP Link ethernet switch/hub network splitter. One cable goes from here to my desktop. Another cable runs from there up through the wall to provide an ethernet connection in my spare room/office upstairs. In the room above that, my son uses wifi for his devices but the signal is weak - it comes from the Hub downstairs.
Can I boost the wifi by attaching a router to the ethernet cable in the room below his?
Is there a way to boost the wifi signal in this way (or another if that's not possible) using a simple setup? I've tried to find info online and when it goes to set up using the IP address etc I get lost due to tech ignorance!
Thanks very much

 

[Bolu]

Hi RandoJozza thanks for that. I'll give it a shot.

 

[Bolu]

I got one of these https://www.amazon.co.uk/WAVLINK-du...omputers&sprefix=wavlink,computers,155&sr=1-4

The problem is its wifi signal is very weak. I wanted to have something that would allow me an ehternet link for my upstairs desktop but also to provide a more powerful wifi signal. Did I get the wrong thing or might I have configured the router wrongly? For some reason, in my son's room it says the virginmedia signal is weak and it has an upload speed of 45mbps. IfI switch to this router it says the signal is strong and the upload speed is 2-3 mbps! Any ideas would be very much appreciated! Thanks