Take the grammar and linguistics pill.
General and Rational Grammar, Antoine Arnauld and Claude Lancelot
https://annas-archive.org/md5/da0b9e2664b0be2dddc001c75c956810
Principles of General Grammar, A. J. Sylvestre de Sacy
https://books.google.com/books?id=sx0SAAAAIAAJ
linguistics
Introduction to Linguistics, MIT OpenCourseWare
https://www.youtube.com/playlist?list=PLUl4u3cNGP63BZGNOqrF2qf_yxOjuG35j
The Study of Language, George Yule
https://sharifling.wordpress.com/wp-content/uploads/2018/09/the-study-of-language-george-yule.pdf
Latin
Familia Romana, Hans Ørberg
https://archive.org/details/familia-romana
https://archive.org/details/familia-romana-and-colloquia-personarum-audio-files
General and Rational Grammar, Antoine Arnauld and Claude Lancelot
https://annas-archive.org/md5/da0b9e2664b0be2dddc001c75c956810
Principles of General Grammar, A. J. Sylvestre de Sacy
https://books.google.com/books?id=sx0SAAAAIAAJ
linguistics
Introduction to Linguistics, MIT OpenCourseWare
https://www.youtube.com/playlist?list=PLUl4u3cNGP63BZGNOqrF2qf_yxOjuG35j
The Study of Language, George Yule
https://sharifling.wordpress.com/wp-content/uploads/2018/09/the-study-of-language-george-yule.pdf
Latin
Familia Romana, Hans Ørberg
https://archive.org/details/familia-romana
https://archive.org/details/familia-romana-and-colloquia-personarum-audio-files