Education World

Education World is a complete online resource that teachers, administrators and school staff can visit each day to find high-quality and in-depth original content. The site is updated daily, offering:

• Carefully curated news briefs on topics that matter to educators;
• Lesson plans, printables, worksheets and thousands of other classroom-ready resources;
• EdTech tips and ideas as well as reviews of apps, websites and tech products; and
• A huge library of professional development articles and columns

Houghton Mifflin Harcourt TV on YouTube

Houghton Mifflin Harcourt is a textbook company.  This site shows short videos covering everything from Math, English, and Science.

Khan Academy

A nonprofit with the mission to provide a free, world-class education for anyone, anywhere.  To get started as a student:  https://www.khanacademy.org/resources/students/resources-for-students/a/getting-started-with-khan-academy

To see what kind of courses, standards, and classes offered:  https://www.khanacademy.org/resources/teacher-essentials/our-content/a/our-subjects-standards-and-classes

National Geographic Classroom Resources

Bring National Geographic to your classroom through lesson plans, maps, and reference resources for all subjects, covering grades Pre-K through 12.

Read Write Think Classroom Resources

Provide educators, parents, and afterschool professionals with access to the highest quality practices in reading and language arts instruction by offering the very best in free materials. Sponsored by International Literacy Association, National Council of Teachers of English (NCTE), and The Verizon Foundation.

Smithsonian Learning Lab

Resources, training, and support to assist caregivers, teachers, and students as they face new learning challenges. Understand history, art, culture, and the sciences through inquiry and analysis. Educators can create interactive experiences. 
How to get started: https://learninglab.si.edu/help/for-teachers/discover