Speaking at Meetups, Conferences, Submitting CFPs

Why is starting at LOCAL MEETUPS recommended before submitting to major conferences?

• AMeetups pay better
• BMeetups have low CFP barriers, smaller forgiving audiences, shorter talks, and let you build speaking reps + produce a recording you can submit as proof-of-experience for bigger events
• CMajor conferences don't accept first-time speakers
• DMeetups are required by law