According to the information I have searched for on the Internet, the most likely planet where humans will first migrate is Mars. Mars is one of the terrestrial planets in the solar system, with a diameter of about half that of the Earth, an axis of rotation inclination and a rotation period comparable to that of the Earth, a surface gravity of about 38% of the Earth, and an atmosphere of 95% carbon dioxide, as well as very little oxygen and water vapor. There is a subglacial lake on Mars with a diameter of 20 kilometers, there is a large amount of liquid water, and later in the rocks of the ancient lake bed, organic matter has been found, which represents traces of life. Mars is in the solar system, which is closest to Earth compared to those exoplanets, making it much more likely that humans will migrate. NASA currently plans to send people to Mars by 2037.
In addition to Mars, there are exoplanets that have also been considered candidates for possible human migration, such as:
Kepler-186f: This is a planet located in the constellation Lyra, 492 light-years from Earth, a rocky planet like Earth, 61% similar to Earth, due to its location in the habitable zone, there may be suitable water and atmosphere, but the amount of solar radiation received is only 32% of that of Earth, that is, when the day is brightest, it is no different from the night of Earth. It has 130 days in a year, but due to its slow rotation, a day is as long as a few weeks on Earth. There are four distinct seasons on this planet, which is also due to the fact that the axis inclination of this planet is quite similar to that of the earth, which is very stable, and also creates a stable climate.
Gliese-581g: This is a planet located in the constellation Libra, about 205 light years. It has only 67 days in a year, with no day and night changes, with eternal day on one side and eternal night on the other. The good news is that because it is heavier than Earth, has enough gravity to have an atmosphere, the atmosphere may be thicker than Earth, and it is also likely to have liquid water or oceans, and the probability of life being close to 100%.
Kepler-62F: This is a planet located in the constellation Lyra, 1200 light-years from Earth, with a radius of 14 times, with a similarity index of 069, than Mars (0.66) Also high. It may be made of rocks, and part of its surface is covered by oceans, so it is highly likely that there are aliens.
Kepler-22b: This is a planet located in the constellation Cygnus, 600 light-years from Earth, which is 24 times larger, 290 days a year. If there is a greenhouse effect similar to that of the earth, the surface temperature can reach 22 degrees Celsius. Such a relatively good environment makes it the most likely to be aliens, and it is one of the targets of human migration.
Tigarden B: This is a planet located in the constellation Aries, about 12 days away from Earth5 light years, so to speak, very close to the earth. Its surface temperature is most likely to be warm, ranging from 0-50 °C, and 60% of the probability is 28 °C, and the optimal temperature for the human body is 26 °C, that is, the surface temperature of Tigaden B is very suitable for human habitation, neither hot nor cold, and human beings will be more comfortable to live on Tigaden B. Scientists have found that the surface temperature of Tigaden B is completely high enough to preserve liquid water, and as long as there is water, it may be suitable for human habitation.
The above are some planets that may be suitable for human migration based on the information on the Internet, but these planets have not been actually explored by humans, so there are still many uncertain factors, such as atmospheric composition, geological activity, radiation level, etc. Moreover, even if these planets are really suitable for human habitation, to get there will require very advanced space technology and a huge investment of resources, which is still very difficult for humans at present. Therefore, I believe that it is better for human beings to cherish and protect our earth, which is our best home.