In the active voice "Inform on" is strongly associated with the meaning of criminal implication given above. However, in the passive it merely indicates an area of coverage. For example, "He is well informed on a wide variety of topics." simply indicates a person whose knowledge covers many areas.

Understanding the Context

For most contexts (definitely including yours) to inform is a transitive verb. That means you need to specify an object (the person being informed, you in your context). You don't need an "expert" to tell you that this verb is normally transitive - that's one of the key items of information given in any dictionary definition. You are informed of something.

Key Insights

In this case, you got information from someone or something, for example another person or a letter. You come to know something. In this case, you didn't know something, and now you do. You are aware of something. In this case, it is just something that you know.

Final Thoughts

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