Many websites offer free patterns in exchange for registering an email with the site. Do not provide an email to any site without parental knowledge and permission. The patterns must be downloaded to a computer, so, again, parental knowledge and permission.
Peekaboo Pattern Shop, free patterns, mostly garments, https://peekaboopatternshop.com/free-sewing-patterns/
Mood Fabrics Blog, 300+ free garment patterns, https://www.moodfabrics.com/blog/category/free-sewing-patterns/page/2/
Jordan Fabrics, free quilt patterns, https://jordanfabrics.com/pages/free-patterns-thumbnails
Patterns For Pirates, free garments and doodad patterns, https://www.patternsforpirates.com/product-category/freebies/