Propaganda is a political tool. A means of persuasion that is meant to appeal to our biases and prejudices. Often seen in a negative light; some of the techniques are neutral. However, it should always be scrutinized when deployed.
These are a few examples of propaganda:
Authority endorsement: When a trusted figure is used to promote an idea or product. It must be true because it was written in a popular book!
Fear-mongering: Afraid people are easy to move into your preferred action. Also fear, uncertainty, and doubt (FUD) is a technique used to impede action. It is done by undermining an idea with untrue information. Just listen to your politicians proposing a bill.
Plain folks: Using the image of average people to push an idea or product. It's all those adverts selling cereals, cleaning products and so on that, you see on TV
Name-calling: Denigrating another party to lower their perception in other people's eyes. Everyone who is driving slower than me on the N1 is a moron and everyone faster than me is a maniac.
Card stacking: Suppressing information and showing a distorted line of facts. I let you read all the good American media, then all the African media is a mere footnote on lesson plans.
Band wagoning: Inducing a feeling of FOMO to get you on board their train. Your peers can be real jerks or angels depending on the lens you are viewing them through.
Slogan campaigning: Repeating the same thing until it sticks. Incessant cheerleading of an idea. Common in religious settings; secular or non-secular.
Divide and conquer: Break up larger strongholds into smaller groups. Deal with the smaller group. A military tactic that also works in deepening the class divide.
Stereotyping: Going off on common stereotypes to either reinforce them or shatter them completely. It's like selling beer with sports to men or associating wearing suits with success.
The list isn't exhaustive. Most of these techniques are simply fallacious reasoning. You will find a lot of these on TV, social media, radio, books, images, newspapers, and more.