First, you need to log in to your Google account and head to the Google Contacts page. From there, you can export your contacts to a CSV file, which is like, a universal format that any device can read. It's pretty straightforward, but just in case, Google has a helpful guide that walks you through the process.
As you're exporting your contacts, you'll notice that Google gives you a few options to choose from, like which contacts to include and what format to use. It's all pretty intuitive, so you shouldn't have any trouble figuring it out. And if you do get stuck, just check out the Google support page for some quick answers.