Creating a properly structured table helps a blind, low-vision and/or screen reader user make sense of a table by reading out the heading titles and then cell content.
Image credits for Column and Row Header steps screen grabs - Eric Silva (n.d) Creating Accessible Tables in Blackboard.
Add a caption to your table.
Add a summary to complex tables provides orientation or navigation hints in complex tables.
If both caption and summary are provided for one table, the summary should not duplicate information present in the caption.