HSLDA - while we don't recommend you join them (they're very Christian and have been documented to require you to sign a statement of faith to receive legal assistance), they always have up to date info on what's needed to homeschool in every state.

Homeschooling Ideas - lots and lots of ideas and resources.

Etsy - a wide variety of planners, shirts, and other homeschooling items.

Teachers Pay Teachers - lots of lessons of all sorts.

Spiral Moon's Discord Server - Homeschooling and other Pagan Parenting forums