Meetups
Here you can keep track of when and where you came across your new relationships.
Skills
You can often think more than yourself. The moment you map all your skills you will be amazed at what you can do.
Companies
You can keep various info for each company.
Persons
As a professional you will encounter many people. You can keep track of it here so you can keep your contacts list of your iPhone clean. You always have the possibility to add the contact details to your contacts.
Projects
With the projects you can keep track of what you do and who you have all come across. If you need to update your CV later, you can use these notes in 1x.