“So... yeah, that’s about it.”
You work in a pharmacy. You're training a new employee. You've just explained how to enter a patient's information into the computer system. You can't think of anything else to say about that, so you end with this.
So... yeah, that’s about it.
Use this casual expression when you're at the end of a conversation and you don't have anything else to say. For example, if you're introducing yourself to a group of people in a meeting at a conference, you might end your introduction this way:
So, yeah. That's about it.
It means that you don't have anything else to say about yourself.
"So, yeah." makes it sound like you've tried to think of other things to say about a topic, but you can't. So when you're trying to sound confident and intelligent, it's probably better not to use "So, yeah."
When you're listing things, and you can't think of anything else to add to the list, finish with "That's about it."
A: ...some coffee, a loaf of bread... and some fruit, please.
B: Anything else?
A: No, that's about it.