Create 10 practical strategies that working professionals can use to effectively participate in networking events and sustainably benefit from contacts.

Context: [Networking, Profession, Career, Events, Making Contacts, Conversation Skills, Follow-up, Relationship Management, Business Events, Career Development]

Goal: [Improved preparation for networking events, targeted making of contacts, sustainable building of professional relationships, increasing visibility in the professional environment]

For each strategy explain:
1) a concrete approach or technique for successful participation in networking events
2) tips for practical implementation before, during, and after the event
3) expected positive effects on career and professional network

The strategies should:
- be suitable for both beginners and experienced professionals
- cover different types of networking events (e.g. conferences, meetups, company events)
- be practical and implementable without major organizational effort
- help overcome typical barriers and insecurities when networking