Use your profile to express who you are to your community. If you have something you want the community to know about you, add it to one of the cards that can be found here.
Your profile also shows everyone what you've been working on, who you're connected to, the recognition you've been getting, and the groups you've most recently visited.
Setting up your profile is the first step to participating in the community.
Feature skills on your profile by adding them. Endorse others' skills by going to their profile.
If you're concerned about privacy, you can limit who sees different parts of your profile by editing your privacy settings.