In the initial days, avoid tying your hair with hairties or tight clips, as they tend to reshape your hair with dents. Leave your hair loose.
Conditioners do not affect your perm or ruin it.So, use the right conditioner after every shampoo, preferably one that is meant for chemically treated hair.
Air dry your hair as far as possible. Avoid blow drying your hair as it can lead to fragility .
Protect your hair from the sun by covering your hair in a scarf when you step out. Also use a cap, if you will be swimming, to avoid exposure to chlorine.