Looker
Get a first impression of Looker. Free trainings are available at the Looker University, like:
Getting Started with Looker
https://training.looker.com/looker-for-data-consumers
Build Reports in Looker Certificate of Completion
Getting Started with LookML Certificate of Completion
https://verify.skilljar.com/c/duqrzsqqickb
And so much more...