1. Open the terminal app (or the terminal in VS Code) and change to the root site directory of the site you are updating

   cd [path/to/site/root/directory]

2. Switch to the main branch and fetch the latest changes

   git checkout master
   git fetch --all
   git pull

3. Create a new branch from the main branch for the Drupal core update

   git checkout -b update/core-[version]

4. Upda

"Composer is a tool for dependency management in PHP. It allows you to declare the libraries your project depends on and it will manage (install/update) them for you." - getcomposer.org

There are multiple ways to update your Drupal 8 installation but I prefer using composer for ease of use. However, if you have multiple PHP installations on your system, composer may use the wrong PHP version. Typically, you would update your Drupal 8 installation like this: