How to do the things this course keeps asking of you — the label, the glassware, the report, the data table, the digits at the end of a calculation.
Come back to these. Nobody remembers on first hearing why the rule for adding measurements differs from the rule for multiplying them, and that is exactly why it is written down.
Two are worth reading before your first lab day: Lab Safety and WHMIS and Measuring Well. The one students return to most across the semester is Significant Figures in Practice.