Meaning of “so” - Learner’s Dictionary

so

conjunction us uk /səʊ/
I grew up on a farm too, so I can identify with his problems.Some of the children came, so there were 15 of us in all.I grew up in Brussels so I know it well.Everything was quiet when I got home so I assumed that you had gone out.There were a lot of dishes to wash so we went at it straight away.
REASON

A2 used to say that something is the reason why something else happens:

I was tired so I went to bed.
Greg had some money so he bought a bike.
so (that)

B1 in order to make something happen or be possible:

He put his glasses on so that he could see the television better.
CONNECT

A2 used at the beginning of a sentence to connect it with something that was said or happened previously:

So we're not going away this weekend after all?

(Definition of “so conjunction” from the Cambridge Learner’s Dictionary © Cambridge University Press)