For a newcomer, 2020 was the perfect time to start: the tool was mature, the documentation vast, and the community active. The fundamentals taught then—Power Query, DAX, data modeling, sharing—remain the backbone of Power BI today.
A collection of data imported or connected to. Power BI can ingest from hundreds of sources (files, databases, web APIs). In 2020, (ETL in the cloud) became a standard way to prepare data before building reports. microsoft power bi - a complete introduction 2020 edition
A free Windows application used for the heavy lifting: connecting to data, cleaning it, and designing complex reports. For a newcomer, 2020 was the perfect time