I think my favourite site has to be Doctor Uke. Not for any special reason or that I think it’s great or anything. Just because it was one of the first I ever came across, it has hundreds of songs on it and it is VERY easy to use and understand.
A favourite tune is a tricky one because I like so many different tunes of different styles for so many different reasons, so I think I’ll abstain from that one if that’s allowed!
All the best.