I know magical_chicken has already posted about a similar topic but their's was about going to Mars and is Mars habitation possible. If you do want to know about that, then go to that post, it is an editor's pick, so it should be easy to find. However, this is different, this is about going to an exoplanet. If you don't know, an exoplanet is a planet outside of our solar system. We have discovered 4126 exoplanets so far, and scientists expect to discover many more. An exoplanet was first discovered in 1917, but was just recognised as another object in space and not an exoplanet. In 1992, however, another planet outside our solar system was confirmed as a planet, so now people thought that they couldn't both just be considered another object in space, so the term exoplanet was created and used. Humans have been thinking about going to some of these planets, as they could be hospitable for life.
Personally, I don't think we should live on an exoplanet as what is the point when we can just go to Mars which is our neighbour. All of these exoplanets are quite far away, the closest being Proxima Centuria b, which is 4.2 light years away. This would take ages too get too and Proxima Centuria b isn't the closest habitable exoplanet, so by the time we get there, we would have all already died, so it would be a pointless journey. We need to find a close habitable planet which could be possible, but is unlikely. I did also think that we could send mankind to various planets, so we don't not fit on one planet together. You might think that this is sort of harsh, as we are the same species so we need to be together as a community, but that just isn't possible, unless we find a habitable planet bigger than Earth. We would also get used to not being with other humans and we might entirely forget about it. To save humanity, we might have to do this as there isn't much hope left for us.
Information found at: en.wikipedia.org/wiki/Exoplanet