The misunderstanding that kills networking
Most people think networking is about handing out cards and pitching yourself. That fails almost universally. Real networking is about being genuinely useful and building relationships before you need anything. The "long game" is the only game that works.
Choose where to spend your time
Only some events deserve your time. Pick groups, events or communities where your ideal clients or natural referrers actually gather. Two great events you keep returning to beat ten random ones you attended once.
Show up to give rather than take
Walk in asking "who can I help here?" rather than "who can help me?". Make introductions for others, share useful information, listen carefully. The reputation you build as a helpful person draws opportunities to you over time.
Have a clear, simple introduction
When asked what you do, answer in one specific, memorable line. Skip the job title; give the problem you solve and for whom. People can only refer you if they remember what you do.
Follow up, properly
Most networking value is in the follow-up rather than the event. A short, personal message within a few days, referencing what you discussed, is far stronger than a generic LinkedIn request. The handful of people who follow up well stand out.
Be patient
Networking is a slow channel. The connection you make today may become a client in two years, or refer you in five. Consistency over time matters far more than any single event.
What comes after this
This question continues in Raising Your Rate With Existing Clients, Keeping Clients and Earning Repeat Work and Acquisition for Starters.