Not on youtube, not on udemy or platforms like that.
So far I’m reading “botany for gardeners” and it’s a noce book, easy to read and to follow. Which is nice, because I wanted something akin to an introduction to botany for people who are not enrolled in an university.
Despite a long-term fascination with botany and medicine, finishing high school I didn't feel that stressing myself to try to get in to medicine was a smart idea. Came back to it a few years ago during COVID and learned with some supportive PhDs at a local plant study group. I'm still firmly at the beginner-intermediate stage but have greatly enjoyed iNaturalist and rediscovering microscopy (the industrial camera based digital microscopes are awesome and can output HDMI directly). Despite being busy with work I've already spotted many endangered species, some of them are the first identifications. I do regret that I had not studied more earlier, as it really adds great interest and depth to exploring new environments during travel.
When trying to learn any new discipline, I recommend this strategy. First, identify some competent world-class universities. Second, search for their related programs. Third, obtain a list of textbooks for those courses. Finally, obtain said textbooks (eg. LibGen). However, if you are feeling lazy just search the topic directly (but be sure to use the scientific title) and then order descending by year. Any textbook with three or more editions is probably well regarded. This method would recommend: ISE Stern's Introductory Plant Biology (15th edition), Botany: An Introduction to Plant Biology (6th edition), Botany for gardeners (3rd edition), Botany in a Day: The Patterns Method of Plant Identification (6th edition), Laboratory Topics in Botany (8th edition).