Some of them are plain wrong, as well. The ы sound barely ever shows up in english and their explanation of "it's the I in bill" is not right at all. The close

Some of them are plain wrong, as well. The ы sound barely ever shows up in english and their explanation of "it's the I in bill" is not right at all. The closest I can get is the imaginary vowel between the D and the N in the word "couldn't", when said slowly. A more useful idea is to say the first sound in the word "about" and then lift your tongue and jaw up. That's much closer.