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It's fabulous. I am self-teaching during lockdown and it breaks learning down so well I am really enjoying it and have just bought the violin one to help a very frustrated violin player! Short, achievable tunes and good online support too.
This is used in school systems for a reason. It is the single best beginning book for a cellist. You gradually, painlessly learn to read bass clef plus where the notes are on your cello, plus little side bars on each page teach you about the instrument, or rhythm, or a composer, or about musical notation etc. This is the best $10 (or whatever) a beginning cellist can spend. There is a code inside the book where you can download recordings to play along with as a bonus.