3 home wifi and networking tips

Working from home has thrown up a few problems for people; if you don't have a small home office then its a laptop on your lap or the kitchen table, sometimes it may be a spare bedroom or a distant room in the house where there is some peace and quiet.

However, this then creates technical problems surrounding getting WiFi or internet conenctions that are reliable, so here is a very practical set of answers to this problem, with costs and links to equipment correct as of May 2020
The Background
Most people at home have a router (with WiFi built in) supplied by their broadband provider (Sky / Virgin / TalkTalk etc). This sits in the lounge or hallway and on the back of the router there is a WiFi Username and Password which you use to connect
The Problem
The location of the router is often not central to the home so distant points of the house and far away rooms suffer with poor coverage, resulting in slow speed.