Improving The Range Of Wireless Signal For Home Routers

I believe it's a commonly searched problem - improving the range of wireless router installed in home. Typically there are multiple obstructions in a typical home environment (walls!) which weaken the Wi-Fi signal strength. I've read about installing another wi-fi router to extend the range, but don't know recall how to do it. Can someone post a solution, tips and tricks to do it? I'm sure large number of our CEans will benefit 😀