I already found what I needed:
To open git bash directly from visual studio without having to manually type the project root folder every time, just add a new external tool command:
In Visual Studio Menu Bar: Tools -> External Tools -> Add New
Title: Git Bash
Command: c:\Program Files (x86)\git\bin\sh.exe
Args: --login -i
Initial Dir: $(SolutionDir)
Doing this, you can search 'Git Bash' under 'Tools' on the Visual Studio Menu Bar and git bash will be opened within your project folder.
Also, you can set a shortcut to your external tools:
- In Visual Studio Menu Bar: Tools -> Options -> Environment -> Keyboard
- In Show commands containing type: Tools.ExternalCommand
- Choose the command you want (the number of the external tool is the position in the list) * Set a shortcut for it (e.g, Ctrl+G, Ctrl+B)