OSGeo Mailing Lists. The Qgis-user list is a useful way to ask questions of the general QGIS world community - initially you may find a lot of the discussions over your head, but you will find that you pick up more and more by just watching the lists. If you can’t find an answer in the User Manual, ask a question here - you will not always get an answer, but they are usually plenty of helpful and knowledgeable people out there.
YouTube videos. Try searching YouTube for QGIS and you will find a number of different training videos. As an example, try