What's the difference among "will do", "be doing" and "be going to do"?
For example, I will go there/ I am going there/ I am going to go there.
What's the difference among these sentences?
And I figure out that native speakers use "be doing" for future tense a lot. How to use it correctly?
Thank you very much.

Question

What's the difference among "will do", "be doing" and "be going to do"?
For example, I will go there/ I am going there/ I am going to go there.
What's the difference among these sentences? 
And I figure out that native speakers use "be doing" for future tense a lot. How to use it correctly? 
Thank you very much.

Answer

i will go there:this will happen in future without having a specific time or this a quick decision 
I'm going there:I'm on my way to there
I'm going to go there: you arrange to go there

please check the difference between future with will and going to and work on it :)