Lessons 1 to 10 concern the basic materials and techniques required to make use of colour, brush and paper. They are full of helpful advice and examples, obviously based on many years of teaching experience and written by a thoughtful, encouraging, talented teacher. I recommend them without reservation. Lessons 11 to 14 concern drawing, but this subject deserves a book to itself and I'd suggest getting one. Nevertheless they would all be helpful if you didn't intend to study drawing otherwise, and Lesson 14 follows on from techniques taught in the first part of the book. This is followed by some demonstrations, and advice on working outdoors; then most of the rest of the book is devoted to practical advice for the beginner on painting various particular kinds of subject.
Like some other reviewers, I don't find the paintings themselves (as reproduced here) inspiring, and this could make the later lessons seem like a slog. The book would be very much better if some paintings by other artists, or Alwyn's students, had been included. But inspiration can be had on a visit to any good gallery. Then you can return to any chapter for the advice of a kindly, intelligent and experienced teacher, not always confined to the subject at hand. That's the way I intend to continue using this book.