The short little word so can be very useful in connecting reasons and actions. It has the same meaning as because but a slightly different way of building sentences.
The grammar of so can be shown as this:
Reason(why)+ so + action(what to do)
It was raining(reason)so I brought my umbrella(action).
Why did you bring your umbrella?
It was raining.
Japanese summer is very hot so I don’t want to go outside.
I am hungry so I will buy something to eat.
Another way to use so, is when you want to tell people about rules or warn them. Like this:
The stove is hot so don’t touch it.
That is the CEO’s cookie so don’t eat it.
There is a lightning storm outside so you should unplug the computer.
So, so is very useful so please use it when giving reasons!