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Hi,

I think I heard from somewhere that a person should use a colon to introduce a vertical list only if a person could use a period (as a matter of common sense?). If that is true, would you say all these uses of the colon I saw so many times are wrong?

The things we need to heed are:

We need to address such topic area as:

In this course, you will find:
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BelieverHi,

I think I heard from somewhere that a person should use a colon to introduce a vertical list only if a person could use a period (as a matter of common sense?). I don't understand what you mean.

If that is true, would you say all these uses of the colon I saw so many times are wrong?

The things we need to heed are: I would NOT do this. Either "What we need to heed:" followed by a bulleted list, or simply remove the colon and continue on with the list

We need to address such topic area as: This one is questionable. I'd want to see more context.

In this course, you will find: This is fine - what follows should be all noun phrases.
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We need to address such topic areaS such as:

''U'' commemorates Detroit tricentennial with special courses - News

Courses address topic areas such as race, politics and activism and are offered in an array of departments. The University will also offer cultural events ...