Stick to your instructor’s schedule as much as you can. Staying on a schedule will help you gain a feeling of normalcy and prevent you from falling behind.
Find out how to ask questions. Is there a chat feature? Is there a discussion forum?
Close distracting tabs and apps. Human beings are not as good at multitasking as they think! See also: Avoid Multitasking.
Continue to take notes as you would if you were there in person.
Review content. If the lecture is covering challenging material, consider watching it a second time to fill in your notes and better absorb the information and use the pause feature.
Watch recordings at normal speed. Research shows that playback speed of 1.5x can lower your retention and can result in lower scores on assessments. Faster playback speeds are worse for complex, multistep material (which most of your lectures probably are).