“Self-care describes a conscious act one takes in order to promote their own physical, mental, and emotional health. There are many forms self-care may take. It could be ensuring you get enough sleep every night or stepping outside for a few minutes for some fresh air.” Quoted from Very Well Mind’s article “5 Self-Care Practices For Every Area of Your Life” as linked below.
Self-care includes strategies to promote health in these areas: physical, social, mental, spiritual and emotional. Examples are how you eat, sleep, exercise, and whatever spiritual practice comforts you. But it just starts here, and may include many other aspects as well.