Leash training... Again. Help?

Now. I am searching up 'how to train a dog to walk on a leash' on youtube and there are too many different things they suggest. I was wondering what would be a type that works for lab/border collies? I tried on from 'Kikopup' last year and it completely failed, she still pulled me all over the place when I tried to train her. I tried more than once, 0 progress over a week. This is appreciated, since I was told to start walking her again... I still need to fix it. Thanks



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