If the wifi is good in one room and bad in another, an easy solution is to get a wifi extender like this: https://www.amazon.com/NETGEAR-Wi-Fi-Range-Extender-EX2700/dp/B00L0YLRUW?ref_=fsclp_pl_dp_1
After you follow the instructions to set it up, you can move it around the house as needed. It does not need to be reconfigured every time you plug it in.