The simplest meanings of these words can be looked up in the dictionary, which will certainly help if you look them up. There are abundant explanations of these words and meanings on the Internet, but the amount of information may be a little large for people who have just come into contact with them. But it doesn't matter. It will be easier to read when you get a deeper understanding. I'm sorry if you say it's history study, especially in the eighth grade. There's no other way. Memorize time and events. By the way, if you have nothing to do every day, you can get familiar with the process of history. In a word, remember, we'll cross the bridge when we come to it. As long as we study hard, there will be no problem.