Webinars are offered through several websites. They are offered by many different presenters and cover a wide range of topics. They typically have beginner, intermediate and advanced courses. The number of webinars available can be overwhelming. Instead of just taking a webinar because it is available, try to identify the learning outcome that you want. Ask yourself: What can I learn from it?
Ancestry - https://www.ancestry.com/academy/courses/recommended (Ancestry Academy)
Family Search - https://www.familysearch.org/ask/landing?search=Getting%20Started&show=lessons&message=true (under Help, Learning Center)
Legacy Family Tree Webinars - https://familytreewebinars.com/
National Archives - https://www.archives.gov/ (search for classes)