Basic accessories are covered in Chapter 2. This fills in more blanks but remember everything yearns for the propeller. If it can go through the prop, it will: Add carefully.
A reserve parachute is a safety accessory, like a helmet, that can save your life. It also adds a minute amount of risk from accidental deployment and increases your rig’s weight. The additional material here will help you make an informed choice.
Other accessories, especially those developed since the book’s publication date, will be covered in more detail.