Self propaganda is when you say or do things to make people think good things about you or what you believe in. It's kind of like when you tell your friends why you think your toy is the coolest one ever, because you want them to like it too. People use self propaganda to make themselves look good or to make their ideas seem better than other people's ideas. It's important to remember though, that sometimes when people use self propaganda they might be exaggerating or not telling the whole truth, so it's always a good idea to check the facts before believing everything you hear.