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ck12.org
In short: Getting listed on CK-12 FlexBooks is free. Plan for about 45 minutes — there is material to prepare and a review to wait on.
What they ask for: Create an age-appropriate digital-citizenship or privacy FlexBook chapter with practical your tool exercises.
Create an age-appropriate digital-citizenship or privacy FlexBook chapter with practical your tool exercises.
Must be substantive K-12 educational content with correct authorship; do not create a product-only page.
Open the submission page on ck12.org and complete its form — that is the "Open submit page" link at the top of this page.
Must be substantive K-12 educational content with correct authorship; do not create a product-only page.
Priority sets the band — this one is medium. Cost (free) and effort (moderate) move it within that band, which puts it in the useful tier. The score orders a submission queue. It is not a measure of the site’s domain authority, traffic or quality.