What is the meaning of 'get start, get started, getting started'?

"Get start" is not a grammatically correct phrase in English. It is likely a typo or a colloquialism.

"Get started" means to begin doing something.

"Getting started" is the process of beginning something.

Here are some examples of how to use these phrases in a sentence:

You need to get started on your homework if you want to finish it on time.

I'm getting started on my new book, and I'm really excited about it.

It's important to have a plan for getting started on your new business.

I hope this helps!