Below you will find links to general learning websites for many grade levels:  

https://www.wizcase.com/blog/free-printable-books-to-help-young-kids-develop-reading-skills/Free Printable Books for young readers to develop reading skills

https://wideopenschool.org/Wide Open School by Common Sense Media

http://bit.ly/CCSDLibraryCCSD School Libraries Learning at Home Site 

https://www.scetv.org/at-home-learningSC ETV Resources and Information about TV Programming

Time For Kids LinkTime for Kids Free Edition for K-6th grade

https://www.wonderopolis.org/wondersMany subjects that you may be wondering about

www.starfall.com CD-3rd grade 

www.abcya.comAll grade levels, Reading, Math and other Topics 

www.scholastic.com/learnathome20 Days worth of Free Lessons 

https://www.vooks.com/parent-resourcesVooks is a streaming library of ad-free, kid-safe animated read-aloud storybooks 

https://www.adventureacademy.com/Ages 8 and up, Reading, Math and Science Content 

https://www.kidsdiscover.com/Science and Social Studies 

mysteryscience.com/school-closure-planningScience videos and lessons 

https://www.arcademics.com/Arcade Style Games for Multiple Grade Levels and All Subjects

https://www.highlightskids.com/Hidden Pictures, Jokes, Games and SO much more.

https://kids.nationalgeographic.com/Many topics and Fun Stuff too!

https://www.funbrain.com/Lots of choices!

https://www.mission-us.org/Interactive History Lessons

http://www.sciencekids.co.nz/Science Kids

https://www.turtlediary.com/Games for all Grades

https://freerice.com/Free Rice reading and vocabulary games

A GREAT BIG LIST OF LINKS! Common Sense Media made a great big list of all sorts of things! You should check it out.