Lesser Known

Don't print raw DataFrames.
One of the best Matplotlib hacks you will ever see.
Hint: This is NOT about sparse data representation.
A decrease in loss may not mean an increase in accuracy.
Validate the merge operation.
GitHub to Colab in a second.
Always review what a specific implementation is hiding underneath.
Another hidden gem for data visualization.
Thinking from a scope perspective.
A guide to visually appealing DataFrames.
...and here's what happens in reality.
Row-then-column is not the same as Column-then-row.