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The merging in git is to merge your branch which you created to main branch. So,that whatever changes u have made in code using branch called xyz that code will be updated in main branch.
The Git marge will combine the changes from two or more branches into a single branch.
Please check my video on how to use git in visual studio
https://youtu.be/G3tyBJXgXb4
Chech Git merge process in below link
https://youtu.be/uBpn_inVJ5I