The WiFi in my on campus apartment sucks,someone told me I should get a wireless router and connect it via the Ethernet port but I don't know what kind I should get. It would be used for my laptop and phone.

Yes, because if you receive low signal rate you should get Router, better connect the LAN or ISP cable to the router and configure the router to give access to certain devices only.

If you see routers manual that is easy to configure the router and don't forget to assign the security key because if that is an open network anyone can access your Internet until they are in your WiFi range.

but when ever you should know that if your home is spread in large area better research on Internet and buy the better one. Many people don't know which router we should buy they will get the kind of router that are low in price and then it not functions correctly.

To be frank I bought a router firstly which I don't know about it and it cannot not spread area in long, if connected disconnects automatically, connects back again and then I researched on Internet got the best router.

So look I have Comcast 150 mpbs,  Using a net gear router. So I tested my speed Ethernet and wireless at the same time But here is one thing why is my Ethernet speed same as wireless speed. Btw got 6 devices connected, 3 wired and 3 wireless,  all them get 156 upload, and 150 download, So can some tell me why I have the same speed for wire and wireless.

Here what happens is the Internet speed for WiFi depends on the WiFi Signal and lets say that you have 5 point signal in your smartphone and the speed is full that which actually your internet have. If the WiFi signal strength is good or normal or poor you may experience the Internet Speed fluctuations or speed decreases.

Until you have a Excellent signal strength you don't face any Internet speed problems.

No need to worry about the speed as you are getting the speed as your Internet Service Provider promised, and your router is also working perfectly?

But for the LAN you may don't experience the Internet Speed problems.