Interesting article on how to teach your dog to use a crate. Apart from transporting dogs in vehicles/planes or possibly a dog shows, I am not a believer in using crates otherwise...particularly 'toilet training' a dog. I have had dogs all of my 70 years and have never had problems toilet training a dog without resorting to a crate. I knew one woman who crated her Weimaraners whenever I visited because she couldn't control them! In my book, that was because they weren't trained to behave. On another occasion I was told by a third party that a galgo I had rehomed was being crated and the children allowed to poke fingers at him! He was fine with the children and other dog when I did home tests/checks...to this day I don't know why she crated him...I didn't ask because I was so angry! Needless to say, I simply messaged that he was to be brought back to me immediately. Was fine with the grandchildren in his thereafter forever home.
We all have our own opinions on this subject, these are simply mine.