Hello! I'll explain this with a couple examples, so that you can understand better: "The people" refers to people in general: "The people in Spain are said to be very open-minded." "If nothing changes, I will talk to the people in charge to ask for an explanation." "Those people" can often be in an offensive way, in order to talk about people you don't like: "I don't want you to go out with those people because they drive their cars too fast." "Why are you talking again to those people?" You CAN'T say "this people" because "people" is a plural word and therefore needs a plural article (these/those people). "These people" is used to talk about people who are close in distance or emotionally: "These people have been suffering for a long time and we must help them." "I would do anything for these people, they're family to me." I hope to have helped you!

The people: people in general Those people: They’re far from you, like their distance. Maybe 10 metres away from you or unreachable distance. Those is the synonym of That, but That for singular and Those for plural. That dog looks so cute. Those dogs look so cute. These people: They’re close to you. These is the synonym of This, but These for plural. This book is interesting. These books are interesting. You need certain direction or location to point Those, That, These, This.