The Astronomical League's material is generally excellent. They also have a nice introductory manual and observing program for beginners called the Universe Sa

The Astronomical League's material is generally excellent. They also have a nice introductory manual and observing program for beginners called the Universe Sampler: https://www.astroleague.org/al/obsclubs/univsamp/univsamp.html https://www.astroleague.org/al/obsclubs/univsamp/univsamp.ht... https://store.astroleague.org/index.php?main_page=product_info&cPath=1&products_id=14 https://store.astroleague.org/index.php?main_page=product_in...