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I'd start with the YouTube video, which introduces many key concepts of classical Chinese poetry.
You may find these resources of interest:
Read Learning Classical Chinese is for everyone (no, seriously!) by John Renfroe from Outlier Linguistics, he provides a comprehensive list of 文言文 resources for beginners all the way to academics.
General Recommendations
Online Resources
Online Dictionaries
Online Courses
Poetry
Forums / Misc
General Recommendations
Online Resources
Online Dictionaries
Online Courses
Poetry
Forums