In a situation where you have to delivery instruction remotely with short notice, focus on the most basic elements you need to meet your course goals. If the situation continues, you can augment those basic activities. These resources are designed to help you make the transition as quickly and easily as possible.
Remember that everyone is in the same boat; you are not expected to create a perfect course or replicate every activity from your in-person course. There is not a best or perfect way to do this: use the tools and methods that work for you, your students, and your course.
Don’t panic. We’re here to help.