MinuteEarth is a youtube channel with over 2 million subscribers. MinuteEarth offers videos about science and the Earth. They have multiple playlists covering topics on animal behavior, geology, and anatomy. Their videos have illustrations or cartoons to follow along with.
AsapScience is a popular youtube channel offering free videos. They cover topics using a whiteboard to illustrate information in a fun and interesting way. They also have a podcast called Sidenote found on Spotify or Apple Podcasts.
Crash Course is a popular youtube channel that provides students in high school and university with essential knowledge covering a range of topics like biology, anatomy, and chemistry. Crash Course videos are all free and provide fast-paced educational information.
Khan Academy is a global classroom that provides free educational videos, exercises, and personalized dashboards with goals. Their resources provide instruction on math for students, covering topics from grade one to high school and university.