What you need to know
A table is appropriate for data that has a meaningful row-and-column relationship. Correct headers let assistive technology announce context as users move between cells.
How to apply it
Add a caption that explains the table, use th for row or column headers, and set scope where it clarifies the relationship. Keep each row and column label concise.
Common mistake to avoid
Do not use tables to position page layout. Do not replace headers with bold td elements; visual formatting alone does not communicate the header relationship.