You don't need to know everything about every data tool. Focus on what will help land you your job.

For Excel:
- IFS (all variations)
- XLOOKUP
- IMPORTRANGE (in GSheets)
- Pivot Tables
- Dynamic functions like TODAY()

For SQL:
- Sum
- Group By
- Window Functions
- CTEs
- Joins

For Tableau:
- Calculated Columns
- Sets
- Groups
- Formatting

For Power BI:
- Power Query for data transformation
- DAX (Data Analysis Expressions) for creating custom calculations
- Relationships between tables
- Creating interactive and dynamic dashboards
- Utilizing slicers and filters effectively

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Hope it helps :)