There is a lot of fantastic podcasts about learning about wine.
Wine for normal people – This is a fantastic podcasts with the philosophy of making wine drinking more accessible and less snobby. It is very informative and nice to listen to. My favorite!
Interpreting wine (London) – This one is new to me but seems very promising.
3 wine guys – Not really my favorite as I find it snobby and not that easy to approach but might be an interesting option if you are drinking their wine and grade it as they tend to grade everything.