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Dear teachers, These’re a couple of obstacles I found along the way: 1. In reference to the syntax symbols, I find it very difficult to know before hand when I have to introduce one between ‘___’   or “___”. Would you be clearer on that explanation? 2. Optional: upload the store transactions dataset to BigQuery: I could not cut and paste Step 11, for some reason (I tried several times). 3. Why must some functions be written in parentheses and some other not? DISTINCT, for example, doesn’t have parentheses, while CAST does. Could you please explain those basic concepts of the SQL syntax?

4. In one of the videos, “Documenting results and the cleaning process”, you jump from Pivot Tables and other spreadsheet features like Find and Replace, to Big Query without telling, which makes it difficult to follow along. I'm doing my best, but sometimes, especially in reference to the SQL syntax learning, I'm not achieving my goals, and feel very frustrated.