The first item in this portfolio is my favourite Randall´s Listening Lab. The reason why I have decided to include it is the fact that there is a really huge number of listening exercises of different levels on various topics in it. I had not found a similar source anywhere else before. The website is being created by an American family for about twenty years. I have done all of the exercises a few times. It helped me a lot to get used to spoken everyday American English, and to improve my listening skills in general.
On the other hand, the other source – BBC Learning English on You Tube – is focused on standard British English. There are many videos there, but I, personally, appreciate Tim´s contributions the most. This channel helps me improve my pronunciation because I think that I am able to pronounce what I can hear.