Many people interested in time travel were interested in the question: if a time machine exists, then why do we not have a bunch of guests from the future in the present?
Many have probably heard that when traveling in time, one cannot break the cause-effect relationship, so as not to damage the space-time continuum. If you have moved in time, then you must do so that the history of the world does not change.
All the events in history that are now known to people have somehow influenced them. We learn by considering these events. Our knowledge gained as a result of working with history affects the whole world. That is, past events are causal why the world looks like it does now. Causal relationships are established. If even one event changes, then all these connections will collapse.
Time travelers must take care not to break these ties.
There is no mention of time travelers in the story. This means that if we go back in time, then we should not say that we are time travelers. This may mean that there are some rules that time travelers must follow.
We have another limitation when we are transported into the past. We cannot use technologies from the future next to people from the past, but if this happened, then we should not pronounce their names. If technology from the future suddenly becomes known to people from the past, it will also affect history.
However, there are loopholes in all of these rules of time travel. They are myths and legends - stories of supernatural events with unusual characters. Usually, historians take these stories as just fiction because of the improbability of the events there. They usually do not check whether these events could be true or not, although these stories do not say that this is fiction. Historical scholars simply do not believe in the characters from these legends.
But these legends are also part of history. Whether people believe in them or not, they already exist as reasons influencing their lives.
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This means that we, moving into the past, can simply disguise ourselves as characters from these legends.
What does it give us? This gives us the right to use technology and science from the future there in the past. We just have to rename some of the terms associated with them.
For example, if you are a doctor, then once in the past you can call yourself a healer, healer or medicine man. Healers are quite common characters in myths, and not only them. Compared to the medicine of the past, the medicine of the future looks like it uses magic.
If you are well versed in chemistry, then in the past you may call yourself an alchemist.
Knowing how to handle electricity, and using electrical appliances, you can call yourself a magician or wizard.
Also, using powerful technologies in the past, you can even call yourself gods.
You are not changing history. You become the reason for the creation of myths and legends that exist in history. That is, you yourself are creating the current history. We know that historians from the future will not believe in your existence, but you don't need it. The main thing is that cause-and-effect relationships in time are preserved, which are important for the world.
That is, in order not to change the cause-and-effect relationship, you yourself must become the cause of the creation of the current story.
For example, if you wanted to build a base-fortress or something else in the times and places of ancient Egypt, then you must do something in the shape of a pyramid.
Various ancient legends often describe how different gods came and taught people to write and craft. This means that you can even teach people in the past.
In our modern time, it is quite difficult to disguise as legends. However, even here there is something to disguise as.
Many UFOs in ours are also legend. To fly, for example, over the sky of the twentieth century, you must create flying machines that look like flying saucers and other objects. You can even use UFO footage to appear there while the same UFO was being recorded. This way you will not disrupt the course of history. Of course, you must know for sure that the video is not fake, otherwise this trick will not work.
There are millions of myths and legends in the history of the world. There are also a huge number of characters in them. Even if we assume that only a part of them are true time travelers, there will still be a decent number of these travelers.
We can say that they were and are everywhere, they are simply called differently. That is, such names that we rarely refer to time travel. They do not go directly to contact, but occasionally they still flicker.