Here's the list of resources I used in writing this class. Hopefully some of them may be of service to you in your own research into this fascinating topic!
Your best choice, in my opinion, is https://www.wizardingworld.com/ .
The Harry Potter series by J. K. Rowling
https://www.wizardingworld.com/ (formerly known as Pottermore.com)
https://harrypotter.fandom.com/wiki/Patronus_Charm
https://en.wikibooks.org/wiki/Muggles%27_Guide_to_Harry_Potter/Magic/Expecto_Patronum
https://www.hp-lexicon.org/magic/patronus/
https://screenrant.com/harry-potter-patronus-charm-explained/
https://owlcation.com/humanities/expecto-patronum-meaning
https://www.hypable.com/pottermore-patronus-quiz-list-of-animals/
https://harrypotter.fandom.com/wiki/Dementor
https://harrypotter.fandom.com/wiki/Lethifold
https://wizardmore.com/patronus-x/
https://frieze.com/article/female-patrons-throughout-history
https://www.wizardingworld.com/features/what-is-a-patronus
https://www.zavvi.com/blog/features/what-does-your-patronus-say-about-you/
https://www.quotev.com/story/3671161/Patronuses-and-Meanings-closed/1
https://www.mugglenet.com/2017/08/patronus-say-personality/
https://patronusappreciation.tumblr.com/
https://hogwartswelcomesyou.tumblr.com/patronus-master
https://dreamingandsleeping.com/
https://whatismyspiritanimal.com/
https://trustedpsychicmediums.com/spirit-animals/
https://www.spirit-animals.com/
https://www.crystalinks.com/totemanimals.html
https://www.universeofsymbolism.com/
http://www.starstuffs.com/animal_totems/index.html
https://www.spirit-animals.com/