If you're using Linux, not to worry, you can get started with Miniconda too!
The following articles will guide you through downloading Miniconda and creating an environment.
Once you've got Miniconda and created an environment with Conda, you'll be able to follow the same steps as in the macOS videos and the rest of the course.
Step 1: Follow the Miniconda download steps in this article: https://docs.conda.io/projects/conda/en/latest/user-guide/install/linux.html
Step 2: Follow the getting started with Conda steps in this article: https://docs.conda.io/projects/conda/en/latest/user-guide/getting-started.html
Step 3: Watch and follow the Mac Environment Setup and Mac Environment Setup 2 videos
Step 4: Continue with the course