In my experience, youtube videos are much better than text for understanding key concepts and terms like that. Depends on your learning style, obviously, but I'd give it a try if I was you.
As for courses, maybe check out Coursera? If you don't need the certificate, it's free as far as I know.
Your examples don't sound directly Finance-specific, so maybe look at something like business essentials, marketing or (management) accounting. If you have a few specific questions, there is a weekly questions thread every monday in this subreddit, questions there generally get answered.