What are the guidelines to decide which column to index?

What are the guidelines to decide which column to index?

- Non-key columns can be dropped from a table only after the non-key index is dropped first.

- Columns can’t be defined in both the key column and the INCLUDE list.

- Non-key columns can be included only in non-clustered indexes.

- Column names can’t be repeated in the INCLUDE list.

- For Included Column Index to exist there must be at least one key column defined with a maximum of 16 key columns and 1023 included columns.
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