First off you really should mave minimum of 50 Mbps and 100Mbps or higher is best. if your having buffereing problems one thing you might check is to see what your WIFI connection is. Most WIFI routers have two outputs 2G and 5G which both have the same password. If on autoconnect and you are on the 2G go to settings and do a forget this connection and do a save this connection for the 5G. The 2G setting gives longer distance on signal and is best for Phone and Ipads since your moving around with them an want to maintain signal. For faster setting use the 5G. If you do a connection to each on your Laptop and do
Speedtest by Ookla - The Global Broadband Speed Test you will see that you get double the download speed with the 5G connection up to your ISP speed provided.
One of the first things I do and most support techs will tell you to do is unplug modem/router for a few minutes then plug back in. This resets device and often takes care of most issues. This works also on Firestick.
Firestick is a sure way to cut the cable cord. It used to be Kodi was the way to go but there is so much more out there that is less hassel. Apps for movies and TV series, Apps for cable channels such as USA, TNT, FX, History, Lifetime, ect.. And for you golfers you do not have to pay to get GOLF CHANNEL
With a little time search on Google you will find everything you need and to save you some time check this site out for Firestick
38 Best FireStick Apps (Feb 2020)| Free Movies, Shows, Live TV, Sports
Happy to help anyone with more questions