You're already networking (whether you know it or not!). The trick is to start networking purposefully. This step is vitally important since most job openings aren't advertised.
Resources to help you network purposefully
The Importance of Networking in a Job Search: a brief overview of the advantages of networking.
Volunteering May Help You Get Your Next Job: This short video posted by VolunteerMatch shows the many ways volunteering could help in your job search.