The public transport in Medellin is very well organized according to Colombian standards.
A metro line has been built along the length of the entire city. Do you have to be in a neighborhood that is located more in the mountains? No problem! In addition to the metro, Medellin has its own cable car! Furthermore, there are also taxis everywhere if you don't feel like traveling by public transport. Useful tip: if you don't have to travel in rush hour, then really to avoid it. In the metropolitan areas it can be ridiculously busy during rush hour. Also note where you keep your phone when you travel on the subway. There are people all over the world who like to take your phone out of your pocket. Medellin is certainly no exception.
FUNFACT: Did you know that Medellin is currently the only Colombian city with a metro network?
In this vibrant city there is a lot to do. Take a look outside the popular areas (El poblado and Laureles). Here you will find the real life of Medellin and the super friendly Paisa people. Be sure to leave some neighborhoods before sunset for your own safety, but please don't let this deter you from going there.
In Medellin there is a well-known saying: don´t give them papaya. This means: Don't make it too easy for thieves by offering your valuables on a silver platter, meaning try to avoid showing off your new iPhone or your expensive watch in the evening. Keep in mind that for many people these (luxury) accessories are not accessible.
Colombians are very curious and proud of their country, so don't be afraid that they want to have a nice chat with you out of nowhere and ask where you come from. Take the time to enjoy this! In Colombia everything goes a bit slower, but the trick is to just to go along with it.
Have you lost your way, feel free to ask for the right direction. You always get an answer! However, this does not always mean that they actually know where to go. Colombians often find it difficult to say that they don't know or can't help you. Sometimes you are sent in the wrong direction. Don't give people money because they help you, instead thank them kindly. By giving money you create the expectation that you will do this the next time again which results in a disappearance of the beautiful spontaneity of the Colombian culture.