How to distribute the Internet through a lan cable without a laptop?

Question

WiFi

Let's say a LAN cable with the Internet is connected to our office. You can connect to a laptop, but from a laptop you can only distribute to 8 devices. How to distribute the Internet differently?
There is an extra tp-link router, is it possible to connect the lan to the router and somehow distribute wi-fi?
The router has 4 lan ports and one dsl port

Answer 1

Why can only 8 devices be distributed from a laptop? where does this restriction come from? Buy a normal router. The price is ridiculous ...
You can do it with this, if he knows how to convert the lan port into a wan port

Answer 2

Router?

Answer 3

Of course you can, the router is designed for this.