In schemas you can check, which metrics and dimensions will be moved from your data source to BigQuery data warehouse. This information is here.

Each tab has information about different data source (for example - Facebook ads), metrics and dimensions and table, in which those metrics and dimensions will appear.

Name in data transfer schema and Bigquery - this is name of metric and dimension, which will appear in data transfer schema and BigQuery dataset. Human name - this is name of metric and/or dimension which would be used in reports or anywhere else, facing end reader.