Intervention group:
Sending recorded self-care training files through WhatsApp for 30 minutes once a day for 8 days, including: explanation of heart function, understanding heart disease and its complications, diet and medication management, sodium and fluid restriction, importance and how to weigh daily, regular exercise, monitoring of signs and symptoms of exacerbation of the disease, non-smoking, social activities, sexual activity, taking medications, following medical instructions and avoiding self-medication.
Control group:
Face-to-face self-care training for 60 minutes every other day for 8 days including: explanation of heart function, understanding heart disease and its complications, diet and medication management, sodium and fluid restriction, importance and how to weigh daily, regular exercise, monitoring of signs and symptoms of exacerbation of the disease, non-smoking, social activities, sexual activity, taking medications, following medical instructions and avoiding self-medication.