Self love - a topic that's quite "fru-fru" - my made up word for mushy, sensitive - yet a necessary topic because it's a vital part of living. Self love is thinking and feeling for yourself. You're in charge of your well being and happiness.
It's understanding your constitution before someone dictates it for you. It's filling yourself up with the things that are right for you rather than looking to others to fill that space.
It's getting back to the very ideas of what makes you excited about living. It's knowing your likes and dislikes, your interests, what you're curious about. It's having confidence in yourself and self worth. Coincidently this is likely where you become more compassionate and empathetic to new ideas and to others.
How is it done in practice? Its going inwards and knowing yourself. You cut out the noise of daily life. Practices like meditation or mindful time alone are superb ways to achieve this.
Then it's being vocal about it. Your inner dialogue shapes your behaviour. You're then aware that you have choices every moment rather than feeling you're largely shaped by the day's events - good or bad.