When working with Git, it's important to keep your repository clean and focused on the source code. This includes excluding unnecessary files and folders such as bin and obj folders from being tracked. Here's how you can exclude bin and obj from Git:

1. Create a .gitignore file: The .gitignore file is used to specify files and folders that Git should ignore. Create a new file called .gitignore in the root of your repository if it doesn't already exist.

2. Specify bin and obj folders: Open the .gitignore file and add the following lines to exclude the bin and obj folders:

```

bin/

obj/

```

3. Save the .gitignore file: Save the changes to the .gitignore file and commit it to your repository. Git will now ignore the bin and obj folders and their contents.

By excluding the bin and obj folders from being tracked in Git, you can keep your repository focused on the source code and avoid cluttering it with unnecessary build artifacts. This can also help improve the performance of Git operations, especially when dealing with large binary files in the bin and obj folders.

It's important to note that once a file or folder is included in a Git repository, it will continue to be tracked even if it is later added to the .gitignore file. To stop tracking an already tracked file or folder, you will need to remove it from the repository using the git rm command.

In summary, excluding bin and obj from Git is an essential practice for maintaining a clean and focused repository. By creating a .gitignore file and specifying the bin and obj folders, you can ensure that Git ignores these unnecessary build artifacts and keeps your repository focused on the source code.