How should one properly handle cats, including the technique of grabbing them by the scruff of the neck?

When handling cats, it is important to approach them gently and calmly. Avoid grabbing them by the scruff of the neck unless necessary, as this can cause discomfort and stress for the cat. Instead, support their body and let them feel secure. If you need to pick them up, do so by scooping them up from underneath. Remember to always respect the cat's boundaries and body language.