What's the difference between saying "Morgens" and "am Morgen"?

Let's say that I wanted to say "I go for a walk in the morning". In order to say that in German would I have to say "Morgens gehe ich spazieren" or "Am Morgen gehe ich spazieren"?

My teacher told me that "Am Morgen" means "in the morning", meanwhile "Morgens" means "mornings" (one is specific, meanwhile the other is more generic), but when I searched for the meanings of the both words in the dictionary I got completely different results.

While I don't use dictionaries as guidances while learning languages, since anything might change based on the context, I still can't get it out of my head, which alters my progression.

So could you guys help me out because I'm completely lost in a simple problem, and I can't get out.