That's a very good question, although this is a very common saying but few people really know what it means to love one-self.
For me self-love, is to appreciate what God gave me and put around me. My life, my body and health, my family, my people. I have to do whatever I can to empower, better and improve myself in ways that only will be beneficial to myself and to my community. Some guys will say they love themselves, yet they hate the Black women, while forgetting that the Black men carry the seed to produce Black women, therefore a Black man hating on Black women and is actually hating himself. As it is written in the Bible love your Neighbor like yourself, don't anything that will bring harm, or negatively affect the community is self-love. Support Black businesses and enterprises. Take care of your family and provide for them is self love. Anything you do help protect and better yourself and your people is self-love.