ancient greek

• alphabet: https://www.greek-language.com/Alphabet.html
• https://www.amazon.de/dp/0520275713/ref=as_at?linkCode=g12&tag=5books0b-21
• https://www.openculture.com/2016/08/learn-ancient-greek-in-64-free-lessons-from-brandeis-harvard.html

biblical hebrew:

• https://israelbiblicalstudies.com/biblical-languages/
• https://www.linguistsoftware.com/gram.htm

latin

• https://www.thelatinlibrary.com/bennett.html#sect13
• https://www.open.edu/openlearn/history-the-arts/getting-started-on-classical-latin/content-section-0?active-tab=description-tab

old norse

• https://en.wikipedia.org/wiki/Old_Norse

quenya

• https://folk.uib.no/hnohf/qcourse.htm
• https://folk.uib.no/hnohf/quenya.htm

sanskrit

• https://www.learnsanskrit.org/grammar/
• https://www.learnsanskrit.org/