Use version control to manage code changes and collaborate with others. Version control is a system that allows you to track changes to your code over time. It allows you to keep a history of all changes made to your code, and to collaborate with others on the same codebase. .NET Core supports several version control systems, including Git and Subversion.

Using version control is essential for several reasons. First, it allows you to keep a history of all changes made to your code. This means that if you make a mistake or introduce a bug, you can easily roll back to a previous version of your code. Second, it allows you to collaborate with others on the same codebase. This means that multiple developers can work on the same code at the same time, without stepping on each other's toes. Finally, it allows you to share your code with others. By hosting your code on a public or private repository, you can make it available to others to use, modify, and contribute to.

Here is an example of how to use Git to manage your code changes. First, initialize a new Git repository in your project directory:

git init

Next, add your files to the repository:

git add .

Commit your changes:

git commit -m "Initial commit"

Finally, push your changes to a remote repository:

git remote add origin <remote repository URL>
git push -u origin master

By following these steps, you can easily manage your code changes and collaborate with others using Git and other version control systems.