Introduction

Hello, Commas go before or after vocatives depending on where they appear. everybody! My name is David S. Kiselev and I was born in <em>southern</em> Russia. Lately, I've been learning British English. I wonder whether there is anyone from the UK here. also I'm learning Dutch and this summer I'm gonna Or "going to" in formal English. start learning Chinese. It's nice to be here. Have a good day! Or "Have a nice day!" which in my opinion, is slighly more common.

Wow David, if you have been learning English just "lately," you are doing an amazing job!

I would just mention two things.  You said South Russia, is that the name of the area?  If not, then we would just say southern Russia.  Next comment I would make is for this sentence: I wonder if there is anyone from the UK here?

Introduction

Hello everybody! My name is David S. Kiselev and I was born in South Russia. Lately I've been learning British English. I wonder is there anyone from The UK here? also I'm learning Dutch and this summer I'm gonna start learning Chinese. Nice to be here, have a good day !