You really should narrow it down.<p>Bill Shillito - Introduction to Higher Mathematics | Just the clarity of presentation and pacing.<p>MIT Calculus Revisited - An almost perfect no nonsense presentation (I like black boards too)<p>Francis Su - Real Analysis - Very engaging lecture style and great board work.<p>Feynman Messenger Lectures - Well its Feynman, and the content is interesting if you are still somewhat new to it.<p>BBC OU courses from generations ago (e.g. Geometrical Topology)<p>NPTEL can have some amazingly well done lecture courses.<p>Also StatQuest and Luis Serano for intuition/conceptualization in Stats & ML.<p>I have been aggregating YouTube lectures at various curation channels that contain what YouTube calls <i>Multiple Playlists</i> that is lists of playlists. I'm perhaps not even half way into filling them up and the lecturers are choosingbto record and upload their courses more and more.<p>[YouTube Aggregation/Curation](<a href="https://arisbe.carrd.co/#section03" rel="nofollow">https://arisbe.carrd.co/#section03</a>)<p><i>Note that YouTube has a strange UI design that people overlook. You have to click on a multiple playlist title to see all its playlists.</i>
They’re from another decade now but the Yale Online Courses are really good<p><a href="https://oyc.yale.edu/" rel="nofollow">https://oyc.yale.edu/</a>
Not an online lecture series per se, but rather some interesting readings: <a href="https://www.ratherlabs.com/blog" rel="nofollow">https://www.ratherlabs.com/blog</a>