Meaning is what a word, action, or concept is all about — its purpose, significance, or definition. If you want to learn the meaning of the word meaning, you just need to look it up in the dictionary.
Meaning represents something's intent or purpose. That something can be a book, a conversation, a television show, or life itself (as in, "the meaning of life"). When you read a poem, you try to figure out the author's intended meaning by interpreting the words he has chosen. For example, if a poet describes love as "a prison," you might interpret the meaning as his feeling confined by his love.