Everything is a sale. When you go to the supermaket to buy what you need, when you go at work and sell your time and knowledge for money or benefits, the time spent with your friends, your relationships, love and even when you do a random good deed you do it for the rewarding feeling you get.
There is no such thing as doing something whitout getting or at least expecting something on return. No one does random disinterested deeds.
If everything is a sale then all your actions are part of that sale. The way you dress, how you speak, your attitude, every single thing you do is your marketing strategy for a sale.
Whatever you do just make sure you don’t sell yourself cheap.