Conferences small and large are scheduled for 2019 and will help you learn beginner, intermediate and advanced topics in Power BI from the experts! Here are some of them:

Microsoft Business Applications Summit
June 10-11, 2019, Atlanta GA, $995

Power Platform Summit
October 15-18, Kissimmee FL, $1099 through June 27

Power Platform World Tour (formerly Power BI World Tour)
April 1-2, Washington DC
April 9-10, Chicago IL
August 28-29, London UK
September 11-12, Copenhagen DK
October 3-4, São Paulo BR
October 23-24, Mexico City
November 13-14, Madrid

Upcoming event list from Microsoft