The first part of the book goes over the different materials that you need to be able to sew knits, including different machines, needles etc. Most of the book assumes you're using a serger, but it also mentions using a zigzag stitch on normal sewing machines and the use of a coverstitch machine. It also goes over the different types of stretch fabrics and their properties.
The book is really great for beginners because explains everything so thoroughly. There's instructions on how to measure yourself, how to lay out pattern pieces, how to cut your fabric, explanations of different sewing terms/supplies and it has lots of handy diagrams for during the sewing process.
My favourite part is probably the modifications for the included patterns. As I said before, there's three patterns: a crewneck t-shirt, a raglan shirt/hoodie and a skirt/dress.
The dress pattern mods look cute too.
Overall, I think this a great book to get started on sewing knits. It provides lots of explanations and I'm a big fan of the visual instructions. I can't wait start sewing some basics!