Salka is a word that comes from a spiritual practice called Sufism. Sufism is a really old way of thinking about spirituality that started a long, long time ago in the Middle East.
Salka is a kind of behavior that's really important to Sufis. It means being polite and respectful to everyone, no matter who they are. It's kind of like being really nice to people even if they're not nice to you.
Sufis believe that being kind and respectful to others is just as important as practicing their rituals and prayers. They think that being a good person is just as important as being a good follower of their faith.
So if you're practicing Sufism and you're trying to be a good Sufi, you should always try to be Salka. That means always being polite, kind and respectful to everyone you meet, even if they're not always nice to you.