Work using Git with Team Members

[Suryasuvendu Biswal]

I'm Using the Source tree for Operating Codes in Git  from last 8 months. But still 

Confused about the Team work .

Simultaneously  we are working 3 to 4 members at a time.

But confused at the time of code merging to the source branch. which is the main branch.

If Any one has a solution to it please allow me to get that.

Thanks.