When to correctly omit the article The in a sentence?

The article "the" can be omitted in sentences when referring to general concepts or plural nouns, such as "Cats are playful." It is also omitted in certain fixed expressions, titles, or names, like "Mount Everest" or "Lake Superior." Additionally, when discussing professions or roles in a general sense, such as "He is a teacher," "the" is typically not used.