Well, in the deepest sense, propaganda is a mind game. It plays of peoples emotions - fear, hope, anger, frustration, sympathy- to direct an audience towards a desired goal.
One way it could appeal to your emotions: People are naturally attracted to conflict. It would appeal to your emotions if someone was arguing against an opponent. It would get you fired up. You would get frustrated or you would hope one of them would win.
There definitely is a differenc. Knowledge is facts and statistic, and things you know that have proof behind it. while an opinion is what you think of somethin g, there’s no logic behind it, it’s just your bias based on experience you have.
The sentence is not grammatically correct, it should be, "Last summer, Jim mowed one lawn, now he mows three." Mowed just one lawn doesn't make sense in one sentence.