We don't need to worry much about them where I'm living now, but for four years we were in Taiwan. There were instructions on a sheet in the kitchen, but there was no typhoon in our first year. I was quite disappointed and, of course, there were water restrictions as we needed the rain it brought.
The next year I found out what they were all about. We criss-crossed the windows with packing tape, filled the bath with water and made all the preparations.
Wow! Was it some storm! The rain got in on the top floor and poured down the stairwell (our only exit) like a waterfall. It shorted our front doorbell so that it would not stop ringing. The strong winds blew the water in under the windows so that it ran down the walls and we had to move away bookshelves, etc. and spent most of the night running around mopping up with towels.
However, we were the lucky ones. An air-conditioner next door was sucked out and landed on a man down on the ground and killed him. Up in the mountains the typhoon caused a landslide. It took a village with it and a lot of people died. It certainly wasn't fun. I feel for the people who live in typhoon areas as it can be really dangerous and frightening.
There must be easier ways for a country to get enough water!