This review is based on the identically-titled free e-book on the author's website and the pages visible here with "Look Inside". The book is sound enough but potential purchasers need to be aware that it's from Australia and reflects the puzzles published there. These are mostly "middlebrow" cryptics rather than the more challenging ones found in papers like the Times or the Daily Telegraph. After an introductory section explaining the various clue types (with 2 or 3 examples for each), you get a set of puzzles (about 75 I would guess from the page count), for which you get both cryptic and straight clues, and answers with explanation showing why they're the answers.
Some clues and advice are contrary to what you'd hope to read about good puzzles: "Initials: Compilers feel free to use only the initial from almost any word - Black B White W Cold C Hot H Energy E Year Y etc". This may seem to be the way compilers work (and might be an accurate description for some), but unless their clue includes "a bit of" or similar, they should only use words to indicate their initial letters when those letters are recorded as abbreviations for the words in an appropriate dictionary - they should not just be invented as required.
"Keen for a new joint (4) KNEE" - a fairly typical clue, with a fault which would have it excluded from good puzzles - "for a new" does not indicate a new order for the word "knee" - it's just a phrase with a word vaguely suggesting an anagram ("new"), and other stuff ("for a") which is there to support the clue's surface reading but plays no part in the cryptic reading. On a practical level it doesn't matter that much because KNEE is a familiar word and "joint" is an easy definition, but the effect is that because the clues are not very precise, the vocabulary and definitions have to be easy or you wouldn't be sure enough of the answers. I know it's going to sound intellectually snobbish, but these are "poor relation" puzzles - the puzzles in the UK broadsheet papers are harder, but much more rewarding - I can't imagine laughing at these clues or remembering them in the way that solvers remember their favourite cryptic clues. And when you get an answer in a good puzzle, you usually know for certain that it is the answer, because of the tighter rules followed by good setters.