How to connect my Smart TV so that can access other devices


I currently have Samsung Smart TV LED TV UN46D6000SF .
This doesn't have inbuilt wifi however it has a provision of LAN connector in built.
Some time back I had try to connect the TV to my modem using a LAN Cable however it doesn't seem to work now.
Can someone please suggest what is the best way to connect my TV so that I can access files from my PC as well as the TV can play the videos/photos available on a Samsung phone.
I believe 2 options are available.
1. Connect using the LAN cable from TV to Modem.
2. Connect wireless. Not sure which kind of device I need to buy to act like a dongle I believe. Maybe chromecast or any other device?

Kindly advise.
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