I was looking for a device that receives my house WiFI and gives me an ethernet, if possible a very high speed WiFi, I would like to put cables everywhere but I can't actually, so this would be my solution.
Thanks in advance.
What you are after is called an "AP Client" (or Access Point Client). Some routers can be run in this mode "off-the-shelf", but a better option might be to get one which can run DD-WRT and simply use that.
An AP Client (when connected to an access point or WIFI router) basically converts between WIFI and Ethernet ports - without routing packets - ie it turns your WIFI into a virtual Ethernet cable and converts it into a physical one.
For a high speed connection though, you might want to get a couple of dual band routers (configure 1 as an AP or router and one as an AP Client) and use the 5 gig band to communicate between the routers, and the 2.4 gig band for general communications for the house.
[ I do note that a repeater can be used as well, however that is going to be less efficient as it rebroadcasts signals ]