Best Homeschooling Resources

What are some of the resources you use for homeschooling, lets share here so we can all benefit. I will go first

  1. I use free textbooks from Openstax, they are just books without step byb step problem solutions
  2. I also use free textbooks from Openprof , it contains step by step problem solutions and ai chat support.

These are the 2 major ones i know right now. But i want to know more