Buy it: from the Latin Mass Society shop;
Read part of it on ISSUU for free.
This is one of the Catholic Truth Society's famous short booklets -- 64 small pages -- explaining different aspects of the life of the Church. It was published in April 2020.
The CTS description:
Experiencing the Extraordinary Form can raise a lot of questions. Why does the priest have his back to the congregation? Why is everything in Latin? How am I meant to take part? This booklet answers these questions so as to help Catholics get a better understanding of the Extraordinary Form and to engage with it in a fruitful way.