At various times, mostly on the Italy forum, I have recommended the zoom art history lectures by the British Institute of Florence (Wednesdays, must register, a recording usually available, and free but a donation is nice), Elaine Ruffolo (Sundays, a recording available for a few days after, free but please donate), and Rocky Ruggiero (Tuesdays, free, no donation strings attached but also no recording). All have zoom classes and in person tours you can pay for. Rocky also has a podcast and short Youtube videos. Yes, I "attend" all of these talks every week.
Today, I discovered Waldemar Januszczak's art history videos on Youtube and am really, really enjoying them --- they are very funny and unconventional and cover a large range of topics that he is interested in. Lots of details and ideas that are new to me. Not just Italian Renaissance and not just Renaissance, either. Here's a link to one of his lecture series: https://youtu.be/OLfoOK62sZc?si=E6subN6HHkwENAVl