Wifi not working

Hello,

The wifi system I currently use once had two routers. The inteet plugged into the modem via coaxial cable, the modem then went to a netgear router, which then went to a wireless router. Upon discovering this, I removed the netgear router, since every device used wifi. However, now my linux laptop will not coect to the wifi, although it can still coect via etheet cable. How do I fix this?

Thank you.