Learn Hardcore Indonesian: Begitu urusan di kantor beres, saya langsung pulang. - As soon as the matter at the office is settled, I go straight home.

Breakdown of Begitu urusan di kantor beres, saya langsung pulang.

What does begitu mean here? I thought it meant like that or so.

In this sentence, begitu means as soon as or once.

So Begitu urusan di kantor beres, saya langsung pulang means:

As soon as the business/matters at the office were finished, I went straight home.

This is a very common use of begitu at the beginning of a clause:

So yes, begitu can mean different things depending on context, and here it functions as a time connector.

Why is there no subject in the first part: Begitu urusan di kantor beres?

Because Indonesian often omits things that are understood from context.

In English, you might expect something like:

But Indonesian does not always need to state I in the first clause if the meaning is already clear.

Here, urusan di kantor beres literally means something like:

The second clause has the subject clearly:

That is enough for the whole sentence to make sense.